Perhaps you should try some spelling variations:
hanh huong » thanh huong, anh huong, manh huong
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, mot chieu
huong cua » dung cua
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, hoc thieu, mot chieu
cong tan » cong tac, cong san, cong thanh
nhan tai » hang tai, van tai, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (doi chieu)) sach - hanh huong cua thong cong tan ((nhan tai) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) sach - hanh huong cua thong cong tan ((nhan tai) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) sach - hanh huong cua thong cong tan ((nhan tai) or (toan tap))*.