Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hien xanh » hien hanh, hien nhanh, chieu xanh
thanh cac » hanh cac, thanh bac, thanh ca
van hang » van khang, van hoang, van thang
cong san » cong tac
than cap » khan cap, thanh lap, than cua
va hang » va nang, va lang, va hanh

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