Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu
trinh tai » trinh toan, trinh tu, trinh han
tai thong » tai thuong, tai phong, tai trong
cong van » cong vang, cong san, song van
ban cau » bang cau, ban can, van 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 hien) or (hoc thieu)) xanh - canh trinh tai thong cong van ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (hoc thieu)) xanh - canh trinh tai thong cong van ban cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (hoc thieu)) xanh - canh trinh tai thong cong van ban cau*.