Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
hieu van » thien van, lieu va, hieu ve
lang van » dang van, tang van, hoang van
van hieu » cao hieu
ta doanh » va doanh, te doanh, ty doanh
cac toc » cac toi, cac nuoc, cac thoi
dan cua » dan ca, ban cua, dai cua
hieu va » lieu va, hieu qua
toc ta » toc tay, toc thai
sac ky » sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (cac ky)) lang van hieu. ((hieu van) OR (hieu va)) cac toc ta doanh dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (cac ky)) lang van hieu. ((hieu van) OR (hieu va)) cac toc ta doanh dan cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (cac ky)) lang van hieu. ((hieu van) OR (hieu va)) cac toc ta doanh dan cua te*".