Perhaps you should try some spelling variations:
banh tran » banh trang, ban tran, canh tranh
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
chi xanh » chi anh, chi danh, chi hanh
tran van » luan van
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - banh tran van ((hang cong) or (dang cong)) dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - banh tran van ((hang cong) OR (dang cong)) dan phan dau.
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - banh tran van ((hang cong) or (dang cong)) dan phan dau*.