Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
doi chieu » doc hieu, doi chi, mot chieu
trinh han » trinh quan
dung dong » dung cong, vung dong, cong dong
luan hoan » luan van
ho chieu » theo chieu, hoc thieu, mot chieu
hoan tu » hoang tu, han tu, doan tu

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 trinh han ((dung dong) or (dung trong)) luan hoan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - canh trinh han ((dung dong) OR (dung trong)) luan hoan tu.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - canh trinh han ((dung dong) or (dung trong)) luan hoan tu*.