Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, dua tren
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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) or (so sach)) ty hang xa hoi. hieu ve cam tuc van hanh dai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ty hang xa hoi. hieu ve cam tuc van hanh dai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ty hang xa hoi. hieu ve cam tuc van hanh dai ((cua tre) or (cua triet))*.