Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
cac xuc » cac nuoc, chat xuc, cac cuoc
cam don » cac don, lam dong, nam dong
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) OR (vu sach)) ky nang xa hoi. hieu van ((cac xuc) or (cam xuc)) cam don vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang xa hoi. hieu van ((cac xuc) OR (cam xuc)) cam don vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang xa hoi. hieu van ((cac xuc) or (cam xuc)) cam don vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky nang xa hoi. hieu van ((cac xuc) or (cam xuc)) cam don vi cua tre*.