Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cau treo » cau theo, cau tren, cau triet
thu sach » thuat sach, thuoc sach, thu hoach
danh vai » danh sai, danh va, doanh van
van danh » van doanh, van anh, van hanh
viec cac » vien cac, viec cua, viec lam
vai cau » va cau, van cau, vai cac
tu sach » su sach, te sach, tu cach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so 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) or (thu sach)) y ((nang ma) OR (tang ma)) hoi. hieu viec cac lo van danh vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y ((nang ma) OR (tang ma)) hoi. hieu viec cac lo van danh vai cau treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y ((nang ma) OR (tang ma)) hoi. hieu viec cac lo van danh vai cau treo*".