Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
duong manh » duong van
hieu lang » chieu sang, hieu quang, nhieu tang
trong can » trong canh, trong chan, trong cac
can trong » cay trong, ban trong, ca trong
cong manh » cong danh, cong thanh, hoang manh
hoc hieu » hoc thieu, hoc hien, doc hieu
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 lang - thanh trong can trong ((cong manh) or (duong manh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh trong can trong ((cong manh) OR (duong manh)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh trong can trong ((cong manh) or (duong manh)) toan ban*.