Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
lam tuc » lam thuoc, luat tuc, nam thuc
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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 ky nang xa hoi. hieu van ((lam tuc) or (lam truoc)) ((va tinh) or (may tinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu van ((lam tuc) OR (lam truoc)) ((va tinh) OR (may tinh)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu van ((lam tuc) or (lam truoc)) ((va tinh) or (may tinh)) vai cua tre*.