Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
doi chieu » doc hieu, doi chi, ho chieu
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tran xay » tra xay, tran day, trinh xay
cong tan » cong tac, cong san, cong thanh
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha tap

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 (doi chieu)) sach - hanh tran xay dung cong tan ((than tap) OR (phan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doi chieu)) sach - hanh tran xay dung cong tan ((than tap) OR (phan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doi chieu)) sach - hanh tran xay dung cong tan ((than tap) OR (phan tap))".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doi chieu)) sach - hanh tran xay dung cong tan ((than tap) OR (phan tap))*.