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
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau tren, cau treo
cac le » cach le, mac le, bac le

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