Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
vanh dai » van dai, vanh tai, lanh dao
thu sach » thuat sach, thuoc sach, thu hoach
cham duc » pham duc, cham soc, pham duy
va vanh » va van, va danh, va hanh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
dai va » mai 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 (thu sach)) ((ky lang) or (ky tang)) xa hoi. hieu va cham duc va vanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va cham duc va vanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ((ky lang) or (ky tang)) xa hoi. hieu va cham duc va vanh dai va triet*.