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
hang cong » dang cong, hang nong, bang cong
cong toan » cong tan, cong hoan, cong tuan
trinh va » trinh van, trinh vat, trinh ve
hang tai » dung tai
va hang » van hang, va nang, va lang

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 toan ((hang tai) OR (hang va))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh trinh va hang cong toan ((hang tai) OR (hang va))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh va hang cong toan ((hang tai) OR (hang va))*.