Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
vanh dai » van dai, vanh tai, lanh dao
hanh dai » hanh tai, hanh dao, thanh dat
dam thuc » am thuc, dan thuc, dai thuc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang

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 ty hang xa hoi. hieu ve ((dam thuc) or (nam thuc)) van ((hanh dai) OR (vanh dai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. hieu ve ((dam thuc) OR (nam thuc)) van ((hanh dai) OR (vanh dai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang xa hoi. hieu ve ((dam thuc) or (nam thuc)) van ((hanh dai) OR (vanh dai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. hieu ve ((dam thuc) or (nam thuc)) van ((hanh dai) OR (vanh dai)) cua triet*.