Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
danh vai » danh sai, danh va, doanh van
van danh » van doanh, van anh, van hanh
vai cuu » vai cua
cac lop » cac hop, cac loai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
cuu tre » cua tre, cau tren, cau treo
cac lo » cac co, cac bo, cac ho

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