Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, tu cach
tinh vi » trinh vi, tinh voi, tinh va
cuu ban » cuu van, cua ban, cuu san
cuc ban » cua ban, cac ban, duc ban
van cam » van nam, van lam, van cau
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 (te sach)) ky tang xa hoi. hieu van cam ((cuc ban) OR (cuu ban)) tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang xa hoi. hieu van cam ((cuc ban) OR (cuu ban)) tinh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang xa hoi. hieu van cam ((cuc ban) OR (cuu ban)) tinh vi cua tre*".