Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
trong san » trong cac, cong san, dong san
dung cong » dung trong
san dung » van dung, dan dung, lan dung
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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 ((((hieu manh) or (chieu sang))) or (thien anh)) - thanh trong san dung cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu manh) OR (chieu sang))) OR (thien anh)) - thanh trong san dung cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) or (chieu sang))) or (thien anh)) - thanh trong san dung cong dan toan ban*.