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