Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
thong cong » trong cong, tong cong, thong thong
doi chieu » doi chi, ho chieu, mot chieu
tranh cua » doanh cua, manh cua
bang cong » dang cong, bang song, hang cong
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (doc hieu)) sach - hanh tranh cua ((thong cong) or (bang cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (doc hieu)) sach - hanh tranh cua ((thong cong) OR (bang cong)) dan than cao.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (doc hieu)) sach - hanh tranh cua ((thong cong) or (bang cong)) dan than cao*.