Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
hanh lai » hanh tai, thanh lap, thanh loi
hanh lam » thanh lap, hanh kem, hanh va
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
cac dai » cac dan, cac bai, can dai
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: thu sach ty xang xa hoi. ((hieu van) OR (hieu va)) cac dai va ((hanh lai) or (hanh lam)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. ((hieu van) OR (hieu va)) cac dai va ((hanh lai) OR (hanh lam)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang xa hoi. ((hieu van) OR (hieu va)) cac dai va ((hanh lai) or (hanh lam)) cua triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. ((hieu van) OR (hieu va)) cac dai va ((hanh lai) or (hanh lam)) cua triet*.