Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
hanh hang » thanh hang, hang hang, hanh han
va truong » van truong, va thuong, va tuong
xa truong » cac truong
cong vang » cong lang, cong quang, cong ngang
vang tuan » van tuan, vong tuan, quang tuan
ho chieu » theo chieu, hoc thieu, mot chieu
tuan cau » toan cau, quan cau, tuan cu

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 (ho chieu)) sach - hanh hang ((va truong) OR (xa truong)) cong vang tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) sach - hanh hang ((va truong) OR (xa truong)) cong vang tuan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) or (ho chieu)) sach - hanh hang ((va truong) OR (xa truong)) cong vang tuan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) sach - hanh hang ((va truong) OR (xa truong)) cong vang tuan cau*.