Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
su sach » vu sach
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va
cuc tre » duc tre, cua tre, cuu tre
nang co » nang cao, nang doc, nang noi
so sach » so sanh, bo sach, co sach
co hoi » co hoc, co loi
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly 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) or (so sach)) ky nang co hoi. ((hieu ve) or (hieu van)) cac lo va hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang co hoi. ((hieu ve) OR (hieu van)) cac lo va hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang co hoi. ((hieu ve) or (hieu van)) cac lo va hanh tai cuc tre*.