Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
qua cam » qua cham, qua cac, qua ca
hanh ve » hanh vi, hanh va, hanh kem
du tren » dua tren, dau tren, duc tren
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
ve du » ve su, te du, va du

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: su sach ky nang ma hoi. hieu qua cam ((tuc va) OR (thuc dan)) hanh ve du tren~.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu qua cam ((tuc va) or (thuc dan)) hanh ve du tren*.