Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu nang » thu hang, thu bang, tho nang
hanh dai » hanh tai, hanh dao, vanh dai
thi nang » thi cong, ki nang, thi hanh
va hanh » van hanh, va thanh, va danh
cam luc » cau luc
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet

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 ((thu nang) or (thi nang)) mai hoi. hieu van ((cam luc) or (cam xuc)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thu nang) OR (thi nang)) mai hoi. hieu van ((cam luc) OR (cam xuc)) va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((thu nang) or (thi nang)) mai hoi. hieu van ((cam luc) or (cam xuc)) va hanh dai cua tre*.