Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
lang thanh » tang thanh, lang thang, nang thanh
dang thanh » dong thanh, dang hanh, hoang thanh
hien hanh » dieu hanh
trinh van » trinh han, trinh quan, trinh toan
hang cong » dang cong, hang nong, bang cong
van hang » van khang, van hoang, van thang

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 hanh - canh trinh van hang cong ((lang thanh) or (dang thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - canh trinh van hang cong ((lang thanh) OR (dang thanh)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - canh trinh van hang cong ((lang thanh) or (dang thanh)) cao*.