Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
hang cong » dang cong, hang nong, bang cong
trinh va » trinh van, trinh vat, trinh ve
phan cau » phan dau, phan cac, phan lap

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 va ((hang cong) or (thong cong)) dan ((phan cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh trinh va ((hang cong) OR (thong cong)) dan ((phan cau) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh va ((hang cong) or (thong cong)) dan ((phan cau) or (phan tu))*.