Perhaps you should try some spelling variations:
duong trong » dung trong
dong trong » dung trong, cong trong, dong thong
lanh tranh » canh tranh, lan tranh, hanh trinh
tranh cua » doanh cua, manh cua
ho chieu » theo chieu, hoc thieu, doi chieu
dan phan » doan phan, dan chan, van phan
phan cac » nhan cach, phan dau, phan lap

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

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