Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, ban thanh, va tinh
tra nang » thi nang, kha nang, da nang
va hanh » van hanh, va danh, ban hanh
cao tuc » dao tuc, cao duc, cao suc
te sach » toc sach
hieu va » lieu va, hieu qua
tu nang » tru nang, tu nong, tu nano
dai va » mai va
va cao » va cac, va co, va dao

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

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