Perhaps you should try some spelling variations:
thuat chung » thuat chuong, thuat hung, thuat nhung
toan thuat » toan thuc, toan thiet, toan thue
chung cong » nhung cong, chong cong, phung cong
hieu lang » chieu sang, hieu quang, nhieu tang
manh toan » thanh toan, anh tuan, tinh toan
cua tinh » cua sinh, va tinh, ha tinh
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (cua tinh)) - manh toan thuat chung cong dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (cua tinh)) - manh toan thuat chung cong dan ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (cua tinh)) - manh toan thuat chung cong dan ((toan cau) or (toan cao))*.