Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan tai » toan tap, doanh tai, toan ban
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 thieu xanh - hanh tranh cua thong ((cong tan) OR (cong tac)) ((toan tai) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - hanh tranh cua thong ((cong tan) OR (cong tac)) ((toan tai) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh cua thong ((cong tan) OR (cong tac)) ((toan tai) or (toan cao))*.