Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
trinh vat » trinh van, trinh luat, sinh vat
anh luan » anh tuan, anh quan, anh xuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sang - canh trinh vat ((phuong cong) or (phuong hoang)) anh luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - canh trinh vat ((phuong cong) OR (phuong hoang)) anh luan van.
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - canh trinh vat ((phuong cong) or (phuong hoang)) anh luan van*.