Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
cua triet » cua viet, su triet, va triet
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cac dai » cac dan, cac bai, can dai
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
dai va » mai va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty xang xa hoi. ((hieu quan) or (hieu qua)) cac dai va hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty xang xa hoi. ((hieu quan) OR (hieu qua)) cac dai va hanh hai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach ty xang xa hoi. ((hieu quan) or (hieu qua)) cac dai va hanh hai cua triet*.