Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
su sach » so sach, vu sach
qua cam » qua cham, qua cac, qua ca
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu ang » tu lang, tu anh, tu quang
tu anc » tu anco, tu anh
luc va » duc va, tuc va, loc va

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 ((tu ang) or (tu anc)) xa hoi. hieu qua cam luc va hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu ang) OR (tu anc)) xa hoi. hieu qua cam luc va hanh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((tu ang) or (tu anc)) xa hoi. hieu qua cam luc va hanh tri cua tre*.