Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sach » chinh sach, chiet tach, chieu sang
phuong dan » phuong danh, phuong doan, huong dan
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua doan » cua doanh, cua dan, cua toan
dan van » dang van, doan van, dao van

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) or (chieu sach))) or (chieu tinh)) - canh tranh cua doan phuong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu lang) OR (chieu sach))) OR (chieu tinh)) - canh tranh cua doan phuong dan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu lang) or (chieu sach))) or (chieu tinh)) - canh tranh cua doan phuong dan van ban*.