Perhaps you should try some spelling variations:
hien quang » bien quang, hien quan, hieu quang
dien quang » diep quang, trien quang, lien quan
hanh doan » hanh doanh, thanh toan, thinh doan
thong van » trong van, thong va, thong quan
va thong » va thuong, va phuong, he thong
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien quang) OR (dien quang)) - hanh doan va thong thong van ((toan cau) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien quang) OR (dien quang)) - hanh doan va thong thong van ((toan cau) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien quang) OR (dien quang)) - hanh doan va thong thong van ((toan cau) or (toan cao))*.