Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xa khanh » xa thanh, van khanh, dat khanh
va triet » va thiet, va trien, ve triet
tra nang » thi nang, kha nang, da nang
hieu va » lieu va, hieu qua
cao tuc » dao tuc, cao duc, cao suc
xa hanh » xa thanh, va hanh, da hanh
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: toc sach ((tu nang) or (tra nang)) xa hoi. hieu va cao tuc ((xa hanh) or (xa khanh)) dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu nang) OR (tra nang)) xa hoi. hieu va cao tuc ((xa hanh) OR (xa khanh)) dai va triet.
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu nang) or (tra nang)) xa hoi. hieu va cao tuc ((xa hanh) or (xa khanh)) dai va triet*.