Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thuat bang » thuat mang, thuat nang, thuat trang
hien sach » dien sach, kien sach, thien hach
thuat ban » thuat bai, thuat bao, thuat san
van khang » van khanh, van thanh, van quang
van hang » van hoang, van thang, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien sach - hanh trinh ((thuat bang) or (thuat ban)) cong ((van hang) OR (van khang)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh trinh ((thuat bang) OR (thuat ban)) cong ((van hang) OR (van khang)) cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sach - hanh trinh ((thuat bang) or (thuat ban)) cong ((van hang) OR (van khang)) cac".
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh trinh ((thuat bang) or (thuat ban)) cong ((van hang) OR (van khang)) cac*.