Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hang doi » hang di, hang loi, huong doi
cam truc » cau truc, nam truc, lam truoc
hang vi » hang va, hanh vi, hang di
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((ma hoi) OR (mai hoi)). hieu van cam truc va ((hang doi) or (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((ma hoi) OR (mai hoi)). hieu van cam truc va ((hang doi) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) OR (mai hoi)). hieu van cam truc va ((hang doi) or (hang vi)) cua triet*".