Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
su triet » su viet, su tien, ve triet
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ma hoi. ((hieu ve) OR (hieu va)) cham thuc va dan va su triet~.
• Adding a wildcard symbol may retrieve word variants: te sach v nang ma hoi. ((hieu ve) or (hieu va)) cham thuc va dan va su triet*.