Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
kho tang » cao tang
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
cua tre » cua te, cua triet, dua tren
nam xuc » cam xuc, nam xua, nam thuc
ky tang » ky nang, ky dang, ky trong
cuu tre » cau tren, cau treo

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 ((ky tang) or (kho tang)) xa hoi. hieu van nam xuc van hanh hai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (kho tang)) xa hoi. hieu van nam xuc van hanh hai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (kho tang)) xa hoi. hieu van nam xuc van hanh hai ((cua tre) or (cuu tre))*.