Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
tran xuan » tran quang, tran van
hoc hieu » hoc thieu, hoc hien, doc hieu
cong san » cong tac
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: hoc hieu cach - thanh ((trung tuan) or (tran xuan)) nhung cong san ((toan tap) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - thanh ((trung tuan) OR (tran xuan)) nhung cong san ((toan tap) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - thanh ((trung tuan) or (tran xuan)) nhung cong san ((toan tap) or (van ban))*.