Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
vu khach » vu khanh, vu khac, vay khach
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va lam » van lam, va lap

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