Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh quan » tinh quang, trinh luat, trinh han
quan dung » quang dung, quan duong, qua dung
dung cong » dung trong
luan phan » luan van
luan hoan » luan van
chi xanh » chi anh, chi danh, chi hanh
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 - canh trinh quan dung cong ((luan phan) OR (luan hoan)) tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi xanh - canh trinh quan dung cong ((luan phan) OR (luan hoan)) tu".
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - canh trinh quan dung cong ((luan phan) OR (luan hoan)) tu*.