Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
vat hanh » vat thanh, van hanh, va hanh
can thuc » dan thuc, van thuc, cay thuc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
hieu ve » hieu van
sach v » sach va, sach y, sach 2
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 v ((sang ma) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) can thuc vat hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v ((sang ma) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) can thuc vat hanh vi va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((sang ma) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) can thuc vat hanh vi va triet*".