Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nham thu, pham thuc
nam thuc » nam thuoc, am thuc, nam thu
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
sach va » sach xa, sach ha, sach dao
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach va nang o hoi. hieu va ((nham thuc) OR (nam thuc)) va hanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach va nang o hoi. hieu va ((nham thuc) OR (nam thuc)) va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach va nang o hoi. hieu va ((nham thuc) OR (nam thuc)) va hanh dai cua te*.