Perhaps you should try some spelling variations:
lanh tranh » lan tranh, hanh trinh, sach tranh
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
bang cong » dang cong, bang song, hang cong
chu bang » thu bang, chuc nang, chu quang
cong tan » cong tac, cong san, cong thanh
toan cao » toan ban
toan tap » toan ban

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 - ((lanh tranh) or (canh tranh)) chu bang cong tan ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - ((lanh tranh) OR (canh tranh)) chu bang cong tan ((toan cao) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - ((lanh tranh) or (canh tranh)) chu bang cong tan ((toan cao) or (toan tap))*.