Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
van lam » van nam
lam duc » lam duoc, pham duc, nam duoc
duc van » duc va, duc tan, duc manh
lai cua » dai cua, hai cua, lai chau
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: ((tu sach) OR (su sach)) ky nang o hoi. hieu van lam duc van hanh lai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang o hoi. hieu van lam duc van hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang o hoi. hieu van lam duc van hanh lai cua te*.