Perhaps you should try some spelling variations:
cong trong » cong thuong, duong trong, cong trinh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
binh hang » binh hoang, minh hang, binh hung
trong tan » trong quan, trong cac, trong ca
tran van » luan van
va cong » tai cong, cua cong

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu lang) or (chieu tinh)) - binh hang va cong trong tan tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (chieu tinh)) - binh hang va cong trong tan tran van.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (chieu tinh)) - binh hang va cong trong tan tran van*.