Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
lanh tranh » canh tranh, lan tranh, hanh trinh
doi chieu » doc hieu, doi chi, ho chieu
lang cong » dang cong, bang cong, lang dong
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, trinh va
gian cao » gian cac, gian co, giai cao

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 (theo chieu)) sach - lanh tranh va ((lang cong) OR (hang cong)) dan gian cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo chieu)) sach - lanh tranh va ((lang cong) OR (hang cong)) dan gian cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (theo chieu)) sach - lanh tranh va ((lang cong) OR (hang cong)) dan gian cao".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo chieu)) sach - lanh tranh va ((lang cong) OR (hang cong)) dan gian cao*.