Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
han thong » han thuong, hang thong, nhan thong
cong vang » cong lang, cong quang, cong ngang
cong san » cong tac
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac

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 - canh trinh han thong ((cong san) or (cong vang)) ((than cap) OR (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh trinh han thong ((cong san) OR (cong vang)) ((than cap) OR (khan cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh trinh han thong ((cong san) or (cong vang)) ((than cap) OR (khan cap))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh han thong ((cong san) or (cong vang)) ((than cap) OR (khan cap))*.