Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, thong thong, phong chong
mot chieu » doi chieu, ho chieu
hoc thieu » toc thieu, hoc hien
trinh cua » tinh cua, trinh luat, trinh quan
tong cong » trong cong, cong cong, dung cong
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((mot chieu) or (hoc thieu)) sach - hanh trinh cua ((thong cong) OR (tong cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((mot chieu) OR (hoc thieu)) sach - hanh trinh cua ((thong cong) OR (tong cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (hoc thieu)) sach - hanh trinh cua ((thong cong) OR (tong cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (hoc thieu)) sach - hanh trinh cua ((thong cong) OR (tong cong)) dan toan cao*.