Perhaps you should try some spelling variations:
hoc thieu » hoc hien
doanh qua » doanh quan, doanh cua, doanh quang
tra trinh » qua trinh
trinh han » trinh quan
danh qua » hanh qua, doanh quan, manh quan
dung tra » dung tri, dung tru, dung trang
han cau » hang cau, phan cau, van cau

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 thieu) OR (toc thieu)) xanh - doanh ((doanh qua) OR (danh qua)) dung tra trinh han cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) OR (toc thieu)) xanh - doanh ((doanh qua) or (danh qua)) dung tra trinh han cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) OR (toc thieu)) xanh - doanh ((doanh qua) or (danh qua)) dung tra trinh han cau*.