Perhaps you should try some spelling variations:
tang quang » dang quang, tang quan, thong quang
hang quang » dang quang, hong quang, hang quan
trung cong » truong cong, trong cong, trung uong
hieu lang » chieu sang, hieu quang, nhieu tang
thanh ban » thanh san, thanh van, thanh bac
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong san, cong thanh
than ban » toan ban, than man, nhuan 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 - anh ((tang quang) OR (hang quang)) trung cong tan ((than ban) or (thanh ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - anh ((tang quang) OR (hang quang)) trung cong tan ((than ban) OR (thanh ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - anh ((tang quang) OR (hang quang)) trung cong tan ((than ban) or (thanh ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - anh ((tang quang) OR (hang quang)) trung cong tan ((than ban) or (thanh ban))*.