Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hieu van » thien van, lieu va, hieu ve
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
hac duc » hoc duc, ha duc, thach duc
va hanh » van hanh, va thanh, va danh
lai cau » lai chau, lai cam, loi cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) OR (ky nang)) xa hoi. ((hieu van) or (hieu va)) hac duc va hanh lai cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) xa hoi. ((hieu van) OR (hieu va)) hac duc va hanh lai cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ky nang)) xa hoi. ((hieu van) or (hieu va)) hac duc va hanh lai cau triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ky nang)) xa hoi. ((hieu van) or (hieu va)) hac duc va hanh lai cau triet*.