Perhaps you should try some spelling variations:
doanh doanh » doanh hoan, doanh thanh, dong doanh
chieu sang » chieu sach, chieu xanh, nhieu tang
duong manh » duong van
hieu lang » hieu quang, nhieu tang, hieu van
ban duong » ban huong, van duong, ban tuong
manh toan » thanh toan, anh tuan, tinh toan
luan ban » luan van, luan san, luan han
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) or (hieu lang)) - ((doanh doanh) OR (toan doanh)) luan ban duong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - ((doanh doanh) OR (toan doanh)) luan ban duong manh toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - ((doanh doanh) OR (toan doanh)) luan ban duong manh toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - ((doanh doanh) OR (toan doanh)) luan ban duong manh toan cao*.