Perhaps you should try some spelling variations:
tranh quang » tran quang, trinh quang, tinh quang
chieu sach » chinh sach, chiet tach, chieu sang
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tieu sach » dien sach, te sach, viet sach
hung cong » hung cuong, phung cong, dung cong
dan phan » doan phan, dan chan, van phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((tieu sach) or (chieu sach)) - hanh tranh quang ((hung cong) OR (nhung cong)) dan phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((tieu sach) OR (chieu sach)) - hanh tranh quang ((hung cong) OR (nhung cong)) dan phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((tieu sach) or (chieu sach)) - hanh tranh quang ((hung cong) OR (nhung cong)) dan phan dau".
• Adding a wildcard symbol may retrieve word variants: theo ((tieu sach) or (chieu sach)) - hanh tranh quang ((hung cong) OR (nhung cong)) dan phan dau*.