Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
sach thue » sach thu, sach thieu, sach tham
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
viec da » viec dat, vien da, viec va
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
xang ma » tang ma, sang ma, rang ma
ca viet » va viet, co viet, hoa viet
xuc va » duc va, tuc va, luc va

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 thue ((xang ma) OR (nang ma)) hoi. hieu viec da xuc va ((hanh vai) or (hanh tai)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thue ((xang ma) OR (nang ma)) hoi. hieu viec da xuc va ((hanh vai) OR (hanh tai)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thue ((xang ma) OR (nang ma)) hoi. hieu viec da xuc va ((hanh vai) or (hanh tai)) ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thue ((xang ma) OR (nang ma)) hoi. hieu viec da xuc va ((hanh vai) or (hanh tai)) ca viet*.