Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
van danh » van doanh, van anh, van hanh
danh vai » danh sai, danh va, doanh van
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
ly nang » ly hang, ly vang, ly quang
cuu tre » cua tre, cau tren, cau treo
cac bo » bac bo, cac co
bo van » vo van, so van, do van

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 ((ly nang) OR (ky nang)) xa hoi. hieu viec cac bo van danh vai ((cuu tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ky nang)) xa hoi. hieu viec cac bo van danh vai ((cuu tre) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ky nang)) xa hoi. hieu viec cac bo van danh vai ((cuu tre) or (dau tren))*".