Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh sat » hanh san, hanh cat, canh sat
cham luc » nhan luc, cham cuu, chat lua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
su sach » vu sach
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
sat su » dat 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)) y nang cao hoi. hieu va ((cham luc) OR (cham soc)) va hanh sat su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang cao hoi. hieu va ((cham luc) OR (cham soc)) va hanh sat su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) y nang cao hoi. hieu va ((cham luc) OR (cham soc)) va hanh sat su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang cao hoi. hieu va ((cham luc) OR (cham soc)) va hanh sat su triet*.