Perhaps you should try some spelling variations:
phuong thu » phuong thuc, phuong thuy, phong thu
hieu lang » chieu sang, hieu quang, nhieu tang
huong thi » luong thi, duong thi, vuong thi
dang cong » dung cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc 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: hoc hieu lang - manh ((phuong thu) or (huong thi)) dang cong manh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - manh ((phuong thu) OR (huong thi)) dang cong manh toan tap*.