Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
cong vang » cong lang, cong quang, cong ngang
vang khan » dang khanh, van phan, van khanh
ho chieu » theo chieu, hoc thieu, mot chieu
hua tong » thuat tong, nhua trong, qua trong
cua tong » cua cong, cua dong, cua nong
khan dam » thanh dam, chang dam, khanh nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) xanh - canh tranh ((hua tong) or (cua tong)) cong vang khan dam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - canh tranh ((hua tong) OR (cua tong)) cong vang khan dam.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - canh tranh ((hua tong) or (cua tong)) cong vang khan dam*.