Perhaps you should try some spelling variations:
dang cong » dung cong
chi xanh » chi danh, chi hanh, chieu xanh
anh tang » anh bang, anh dang, anh nang
anh dong » anh huong, anh son
cong anh » cong danh, dong anh, hong anh
anh luan » anh tuan, anh quan, anh xuan
luan ban » luan van, luan san, luan han
chi anh » chi danh, chi hanh, thi anh
va dang » van dang, va nang, va lang

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) OR (chi anh)) - ((anh tang) or (anh dong)) va dang cong anh luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi xanh) OR (chi anh)) - ((anh tang) OR (anh dong)) va dang cong anh luan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi xanh) OR (chi anh)) - ((anh tang) or (anh dong)) va dang cong anh luan ban*".