Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
doanh va » doan va, doanh tai, doanh cua
chua tre » chua tri, cua tre, chua trieu
te sach » toc sach
lang xa » lang ha, dang xay, lang van
va chua » vua chua, ca chua, va chu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((lang xa) or (hang va)) hoi. hieu van ((nam thuc) OR (nam thu)) vay doanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((lang xa) OR (hang va)) hoi. hieu van ((nam thuc) OR (nam thu)) vay doanh va chua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((lang xa) or (hang va)) hoi. hieu van ((nam thuc) OR (nam thu)) vay doanh va chua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((lang xa) or (hang va)) hoi. hieu van ((nam thuc) OR (nam thu)) vay doanh va chua tre*.