Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec chat » viec cua, viec cho, ve chat
chat xuc » chat huu, cam xuc, chao xu
xuc tuan » duc thuan, quoc tuan, xuan tuan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
tai cua » thai cua, tri cua, dai cua
o hoi » co hoi, o hoc, o hai

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 ((o hoi) or (co hoc)). hieu viec chat xuc tuan anh ((tai cua) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hoi) OR (co hoc)). hieu viec chat xuc tuan anh ((tai cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((o hoi) or (co hoc)). hieu viec chat xuc tuan anh ((tai cua) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) or (co hoc)). hieu viec chat xuc tuan anh ((tai cua) OR (tai cuc)) tre*.