Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
khong cong » thong cong, khong cang, chong cong
hien sang » hien trang, khien bang, chieu sang
tuong cua » truong cua, huong cua, thong cua
cua khong » hua khong, cua phuong, cua thuong
cong tan » cong tac, cong san, cong thanh
than ban » thanh ban, than man, nhuan ban
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: hoc hien sang - thanh tuong cua khong cong tan ((than ban) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - thanh tuong cua khong cong tan ((than ban) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - thanh tuong cua khong cong tan ((than ban) or (toan ban))*.