Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
thanh tung » thanh cong
hua khong » hoa khong, cua khong, hoac khong
thong van » trong van, thong va, thong quan
tung hua » trung hoa, cung chua, dung nhua
van toan » van tuan, van tan, van thanh
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 ((chieu sang) or (chiet tach)) - thanh tung hua khong thong van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - thanh tung hua khong thong van toan ban*.