Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, han tai
thi nang » thi cong, ki nang, thi hanh
chat tuc » chat xuc, luat tuc, chat huu
xa hanh » xa thanh, xa khanh, va hanh
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, tu cach
te sach » toc sach
tai va » thai va, mai va, tri va

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) OR (te sach)) thi nang ((xa hoi) or (ma hoa)). hieu va chat tuc xa hanh tai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) thi nang ((xa hoi) OR (ma hoa)). hieu va chat tuc xa hanh tai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) thi nang ((xa hoi) or (ma hoa)). hieu va chat tuc xa hanh tai va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) thi nang ((xa hoi) or (ma hoa)). hieu va chat tuc xa hanh tai va triet*.