Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
hanh doanh » hang doanh, chinh doanh, doanh doanh
doanh luan » doanh nhan
luan thong » luan phong, luan tuong, luat thong
thong van » trong van, thong quan, truong van
thong va » thong cua, truong va, thong qua
anh tai » hanh tai, anh thai, vanh tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu quang) or (hieu qua)) - hanh doanh luan thong ((thong van) OR (thong va)) anh tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu quang) OR (hieu qua)) - hanh doanh luan thong ((thong van) OR (thong va)) anh tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu quang) or (hieu qua)) - hanh doanh luan thong ((thong van) OR (thong va)) anh tai".
• Adding a wildcard symbol may retrieve word variants: theo ((hieu quang) or (hieu qua)) - hanh doanh luan thong ((thong van) OR (thong va)) anh tai*.