Perhaps you should try some spelling variations:
hanh cong » thanh cong, hang cong, hanh dong
cua triet » cua viet, su triet, va triet
hieu van » thien van, lieu va, hieu ve
cong cua » cong cu, dong cua, huong cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
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 ky nang cao hoi. ((hieu van) OR (hieu va)) cam ((xuc va) or (thuc va)) hanh cong cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoi. ((hieu van) OR (hieu va)) cam ((xuc va) OR (thuc va)) hanh cong cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang cao hoi. ((hieu van) OR (hieu va)) cam ((xuc va) or (thuc va)) hanh cong cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoi. ((hieu van) OR (hieu va)) cam ((xuc va) or (thuc va)) hanh cong cua triet*.