Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dung doi » huong doi, dung co, dung mo
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cuu tre, cua triet, dua tren
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 ky nang xa hoi. hieu van cam tuc xa ((dung doi) or (dung tai)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu van cam tuc xa ((dung doi) OR (dung tai)) ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu van cam tuc xa ((dung doi) or (dung tai)) ((cua tre) or (cua te))*.