Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
tang ma » mang may, tang van
sang ma » nang ma, sang tao, mang may
sach lo » sach dao, sach doi, sach hoi
cac tac » cac toc, cac bac, cac dac
va hang » van hang, va nang, va lang
va chua » vua chua, va chu, a chua
ca chua » ca cua, sua chua
tu sach » thu sach, su sach, te sach
tac va » tac da, tac xa, tuc 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 lo ((sang ma) or (tang ma)) hoa. hieu viec cac tac va hang ((va chua) OR (ca chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach lo ((sang ma) OR (tang ma)) hoa. hieu viec cac tac va hang ((va chua) OR (ca chua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo ((sang ma) or (tang ma)) hoa. hieu viec cac tac va hang ((va chua) OR (ca chua)) tre*".