Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh tai
vat hanh » vat thanh, van hanh, va hanh
vu sach » vu bach, vu khach
vai cua » dai cua, hai cua, lai cua
su sach » so sach
vu nang » vuc nang, va nang, vu dang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) vu nang xa hoi. ((hieu ve) or (hieu va)) nam thuc vat hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) vu nang xa hoi. ((hieu ve) OR (hieu va)) nam thuc vat hanh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) vu nang xa hoi. ((hieu ve) or (hieu va)) nam thuc vat hanh vai cua tu*.