Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
dau tren » dau tien, dat tren, dau tieng
danh vai » danh sai, doanh van, dang van
viec cac » vien cac, viec cua, viec lam
nang xa » nang x, lang xa, nang ma
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
danh va » doanh va, hanh va, anh va
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, te sach
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 xa hoi. hieu viec cac bo van ((danh vai) OR (danh va)) ((cuu tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. hieu viec cac bo van ((danh vai) OR (danh va)) ((cuu tre) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. hieu viec cac bo van ((danh vai) OR (danh va)) ((cuu tre) or (dau tren))*".