Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
theo chieu » theo tieu, ho chieu, theo chu
thong cong » trong cong, thong thong, phong chong
tong cong » trong cong, cong cong, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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 (doc hieu)) sach - hanh trinh va ((thong cong) or (tong cong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) sach - hanh trinh va ((thong cong) OR (tong cong)) dan than cao.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) sach - hanh trinh va ((thong cong) or (tong cong)) dan than cao*.