Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung cap, dung cua
hoc hieu » hoc thieu, hoc hien, doc hieu
anh quan » ban quan, anh nhan, anh quoc

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 - hanh ((trung cua) OR (trung tuan)) nhung cong ((anh quan) or (anh tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((trung cua) OR (trung tuan)) nhung cong ((anh quan) OR (anh tuan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh ((trung cua) OR (trung tuan)) nhung cong ((anh quan) or (anh tuan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((trung cua) OR (trung tuan)) nhung cong ((anh quan) or (anh tuan)) ban*.