Perhaps you should try some spelling variations:
thuoc ban » thuoc tan, thuoc dang, thu ban
nha thuoc » nha nuoc, nhan thuc, nha hoc
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
vu khac » vu kham, vu khanh, bui khac
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
vai cua » hai cua, lai cua, bai cua
va nha » va nho, ve nha

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

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