Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
cac xuc » cam xuc, chat xuc, cac cuoc
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
dan vi » doan vi, dan va, gan vi

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