Perhaps you should try some spelling variations:
phuong cong » phong cong, phung cong, phuong hoang
phuong dong » phuong dung, phuong hoang, chuong duong
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 va » trinh van, trinh vat, trinh ve
anh luan » anh tuan, anh quan, anh xuan
luan ban » luan van, luan san, luan han

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 va ((phuong cong) or (phuong dong)) anh luan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - canh trinh va ((phuong cong) OR (phuong dong)) anh luan ban.
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - canh trinh va ((phuong cong) or (phuong dong)) anh luan ban*.