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
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
than cau » phan cau, than cap, thanh chau
toan cau » 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: hoc thieu xanh - hanh tranh va ((trong cong) or (dung cong)) dan ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - hanh tranh va ((trong cong) OR (dung cong)) dan ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - hanh tranh va ((trong cong) or (dung cong)) dan ((than cau) or (toan cau))*.