Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va triet » va thiet, va trien, ve triet
va thanh » gia thanh, va tinh, le thanh
cac luc » cau luc, coc luc, cac nuoc
tu sach » thu sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
vi va » vi van, vai va, vu 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 (su sach)) ky nang ma hoi. hieu va cac luc ((va thanh) OR (ban thanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ma hoi. hieu va cac luc ((va thanh) OR (ban thanh)) vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ma hoi. hieu va cac luc ((va thanh) OR (ban thanh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ma hoi. hieu va cac luc ((va thanh) OR (ban thanh)) vi va triet*.