Perhaps you should try some spelling variations:
hien hanh » dieu hanh
thanh van » thanh san, thanh toan, thanh phan
hieu hien » bieu hien, dieu hien, chieu chien
va thanh » gia thanh, ban thanh, va tinh
hanh luc » hanh phuc, hanh luat, thanh luu
kho tang » cao tang
tu sach » thu sach, te sach, tu cach
van cua » vang cua, ban cua, dan cua
ky tang » ky nang, ky dang, ky trong
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
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: ((tu sach) or (su sach)) ((ky tang) or (kho tang)) xa hoi. hieu hien hanh luc va thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((ky tang) OR (kho tang)) xa hoi. hieu hien hanh luc va thanh van cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ((ky tang) or (kho tang)) xa hoi. hieu hien hanh luc va thanh van cua tre*.