Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh manh » hanh mang, lanh manh, hoang manh
thanh cac » hanh cac, thanh bac, thanh ca
than cap » khan cap, thanh lap, than cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo hieu lang - hanh manh ((cua nhung) OR (va nhung)) cong thanh ((than cap) or (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh manh ((cua nhung) OR (va nhung)) cong thanh ((than cap) OR (thanh cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh manh ((cua nhung) OR (va nhung)) cong thanh ((than cap) or (thanh cac))".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh manh ((cua nhung) OR (va nhung)) cong thanh ((than cap) or (thanh cac))*.