Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
van thang » van thanh, van hang, van than
van khang » van khanh, van thanh, van quang
doc hieu » toc thieu, hoc thieu, hoc hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (theo chieu)) xanh - canh tranh cua nhung cong ((van thang) OR (van khang)) tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo chieu)) xanh - canh tranh cua nhung cong ((van thang) OR (van khang)) tai.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (theo chieu)) xanh - canh tranh cua nhung cong ((van thang) OR (van khang)) tai".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo chieu)) xanh - canh tranh cua nhung cong ((van thang) OR (van khang)) tai*.