Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
cua nhung » va nhung
cong tat » cong tac, cong tan, cong hat
tang ban » tang bang, tiang ban, tang van
can ban » van ban, 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 ((chieu sang) or (hieu lang)) - canh tranh cua nhung cong tat ((can ban) or (tang ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - canh tranh cua nhung cong tat ((can ban) OR (tang ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - canh tranh cua nhung cong tat ((can ban) or (tang ban))*.