Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
thai cua » than cua, tai cuc, tri cua
anh thai » anh thi, anh tai, nhanh thai
lang van » dang van, tang van, hoang van
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet

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 ty ((lang xa) or (lang van)) hoi. hieu cua cac ((xuc ban) or (duc ban)) anh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (lang van)) hoi. hieu cua cac ((xuc ban) OR (duc ban)) anh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((lang xa) or (lang van)) hoi. hieu cua cac ((xuc ban) or (duc ban)) anh thai cua tre*.