Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » hoc hien
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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) or (toc thieu)) xanh - canh trinh van ((hang cong) OR (hang nong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) xanh - canh trinh van ((hang cong) OR (hang nong)) dan chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) xanh - canh trinh van ((hang cong) OR (hang nong)) dan chan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) xanh - canh trinh van ((hang cong) OR (hang nong)) dan chan cau*.