Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, mot chieu
hanh tang » hanh trang, anh tang, hanh mang
ho chieu » theo chieu, hoc thieu, mot chieu
cong tan » cong tac, cong san, cong thanh
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 tieu) or (((ho chieu) OR (doi chieu)))) sach - hanh tang va nhung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (((ho chieu) OR (doi chieu)))) sach - hanh tang va nhung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (((ho chieu) OR (doi chieu)))) sach - hanh tang va nhung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (((ho chieu) OR (doi chieu)))) sach - hanh tang va nhung cong tan toan cau*.