Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
nhung cong » dung cong, thong cong, nhung don
mot chieu » doi chieu, ho chieu
hanh tang » hanh trang, anh tang, hanh mang
hang cong » dang cong, hang nong, bang cong
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
tang va » trang va, tang van, thang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (mot chieu)) sach - hanh tang va ((nhung cong) or (hang cong)) tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (mot chieu)) sach - hanh tang va ((nhung cong) OR (hang cong)) tan toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (mot chieu)) sach - hanh tang va ((nhung cong) or (hang cong)) tan toan cau*.