Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lang van » dang van, tang van, hoang van
sach thu » sach thue, sach thieu, sach tham
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, dua tren
anh hoi » anh noi, anh hoc, anh khoa
ban anh » ban hanh, ban banh, ban danh
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
nang xa » nang x, lang xa, nang ma
qua cac » cua cac

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 thu ((nang xa) or (lang van)) hoi. hieu qua cac xuc ban anh hoi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((nang xa) OR (lang van)) hoi. hieu qua cac xuc ban anh hoi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) or (lang van)) hoi. hieu qua cac xuc ban anh hoi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) or (lang van)) hoi. hieu qua cac xuc ban anh hoi ((cua tre) OR (cua triet))*.