Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
nam luc » nhan luc, nam thuc, nam duoc
va hanh » van hanh, va thanh, va danh
vi su » va su, ve su, ki 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 ky nang ((van hoi) OR (van hoc)). hieu van ((nam luc) or (nang luc)) va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((van hoi) OR (van hoc)). hieu van ((nam luc) OR (nang luc)) va hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((van hoi) OR (van hoc)). hieu van ((nam luc) or (nang luc)) va hanh vi su triet*".