Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ma hoi. hieu van cac ((tuc va) or (tuc xa)) hanh vi ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu van cac ((tuc va) OR (tuc xa)) hanh vi ((cuu tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu van cac ((tuc va) or (tuc xa)) hanh vi ((cuu tre) or (cua te))*.