Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
lam duoc » nam duoc, luat duoc, lam thuoc
tinh doi » trinh doc, trinh do, tinh hoc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
duoc va » nuoc va, duc va, duoc ma
dinh vi » dinh ve, dinh viet, dinh tri
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) or (lieu va)) lam duoc va ((dinh vi) or (tinh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu van) OR (lieu va)) lam duoc va ((dinh vi) OR (tinh doi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu van) or (lieu va)) lam duoc va ((dinh vi) or (tinh doi)) cua tre*.