Perhaps you should try some spelling variations:
luan phuong » lan phuong, quang phuong, doan phuong
phuong cong » phuong dong, phong cong, phung cong
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu lang » chieu sang, hieu quang, nhieu tang
lang luan » tang luan, hang luan, bang luan
cong tinh » cong trinh, cong vinh, long tinh
chi sang » chi lang, chieu sang, chi chang
toan ban » van ban

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 sang) or (hieu lang)) - nhanh lang luan phuong cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi sang) OR (hieu lang)) - nhanh lang luan phuong cong tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: doi ((chi sang) or (hieu lang)) - nhanh lang luan phuong cong tinh toan ban*.