Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh cong » thanh cong, hang cong, hanh dong
hieu van » hieu va, thien van, lieu va
cong cua » cong cu, dong cua, huong cua
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach thu, xach tay
cao hoi » cau hoi, co hoi, cao hoc
sach tu » sach thu, cach tu, sach uu
van cau » van dau, van hau, van chat
xuc va » duc va, tuc va, luc va

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 ty) OR (sach tu)) nang cao hoi. hieu van cau ((xuc va) or (thuc va)) hanh cong cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang cao hoi. hieu van cau ((xuc va) OR (thuc va)) hanh cong cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach tu)) nang cao hoi. hieu van cau ((xuc va) or (thuc va)) hanh cong cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach tu)) nang cao hoi. hieu van cau ((xuc va) or (thuc va)) hanh cong cua triet*.