Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
dang luan » dung luan, hang luan, dan luan
tang luan » dung luan
cong tinh » cong trinh, cong vinh, long tinh
phu hieu » phu nhieu, nhu hieu, thuc hieu
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: phu hieu lang - anh ((dang luan) or (tang luan)) thong cong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phu hieu lang - anh ((dang luan) OR (tang luan)) thong cong tinh toan tap*.