Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung can » trung cap, trong can, trung ca
trung van » truong van, trong van, trung va
hoc hieu » hoc thieu, hoc hien, doc hieu
cong anh » cong danh, hong anh, cong thanh
dong anh » hong anh, dong thanh, hoang anh
tuan ban » tuan bang, toan ban, luan 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 ((trung can) or (trung van)) trong ((cong anh) OR (dong anh)) tuan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh ((trung can) OR (trung van)) trong ((cong anh) OR (dong anh)) tuan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - thanh ((trung can) or (trung van)) trong ((cong anh) OR (dong anh)) tuan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh ((trung can) or (trung van)) trong ((cong anh) OR (dong anh)) tuan ban*.