Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, hieu quang, nhieu tang
hanh mang » nhanh mang, nhanh lang, thanh hang
cong cong » cong dong, trong cong, dung cong
cong vang » cong lang, cong quang, cong ngang
vang van » dang van, tang van, lang van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu tinh)) - ((hanh mang) OR (hanh trang)) cua cong cong vang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu tinh)) - ((hanh mang) OR (hanh trang)) cua cong cong vang van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) or (chieu tinh)) - ((hanh mang) OR (hanh trang)) cua cong cong vang van ban".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu tinh)) - ((hanh mang) OR (hanh trang)) cua cong cong vang van ban*.