Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
tan thanh » tran thanh, tang thanh, toan thanh
thuoc tan » thuoc tai, thuoc ban, thuoc tren
cam thuoc » cay thuoc, nam thuoc, lam thuoc
vu khach » vu khanh, vay khach, cua khach
thu sach » tu sach, thuat sach, thuoc sach
vai cua » dai cua, hai cua, lai cua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
vu khac » vu kham, vu khanh, bui khac
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((vu khach) OR (vu khac))) or (thu sach)) ky tang ma hoi. lieu va cam thuoc tan thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu khach) OR (vu khac))) OR (thu sach)) ky tang ma hoi. lieu va cam thuoc tan thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((vu khach) OR (vu khac))) or (thu sach)) ky tang ma hoi. lieu va cam thuoc tan thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((vu khach) OR (vu khac))) or (thu sach)) ky tang ma hoi. lieu va cam thuoc tan thanh vai cua tre*.