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, trung va, trung tuan
trong van » trong cac
hoc hieu » hoc thieu, hoc hien, doc hieu
cong anh » cong danh, dong anh, hong 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) OR (trong van)))) trong cong 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) OR (trong van)))) trong cong 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) OR (trong van)))) trong cong anh tuan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh ((trung can) or (((trung van) OR (trong van)))) trong cong anh tuan ban*.