Perhaps you should try some spelling variations:
tranh tuan » tran tuan, tranh luan, thanh tuan
hoang long » hoang trong, thang long, hoang son
kinh sach » sinh sach, tinh sach, chinh sach
dinh sach » sinh sach, tinh sach, chinh sach
sang than » cang thang, dang thanh, sang tao
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((kinh sach) or (dinh sach)) - canh tranh tuan ((hoang long) OR (hoang vuong)) sang than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((kinh sach) OR (dinh sach)) - canh tranh tuan ((hoang long) OR (hoang vuong)) sang than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((kinh sach) or (dinh sach)) - canh tranh tuan ((hoang long) OR (hoang vuong)) sang than cap".
• Adding a wildcard symbol may retrieve word variants: hoc ((kinh sach) or (dinh sach)) - canh tranh tuan ((hoang long) OR (hoang vuong)) sang than cap*.