Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh cua » manh cua, hang cua, hanh sua
su triet » su viet, su tien, ve triet
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
cam hoc » cao hoc, am hoc, cam hoa
va hanh » van hanh, va thanh, va danh
cua su » qua su

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