Perhaps you should try some spelling variations:
thanh tung » thanh cong
khong cong » thong cong, khong cang, chong cong
hien sang » hien trang, khien bang, chieu sang
cua khong » hua khong, cua phuong, cua thuong
tung cua » trung cua, tuong cua, dung cua
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 tung 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 tung cua khong cong tan ((than ban) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - thanh tung cua khong cong tan ((than ban) or (toan ban))*.