Perhaps you should try some spelling variations:
thanh trung » thanh tung
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, phong chong
theo chu » theo chieu, cho chu, chao chu
chu sach » cau sach, thu sach, chieu sach
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 chu sach - ((thanh trung) or (hanh trinh)) cua ((thong cong) OR (thong thong)) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu sach - ((thanh trung) OR (hanh trinh)) cua ((thong cong) OR (thong thong)) dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu sach - ((thanh trung) or (hanh trinh)) cua ((thong cong) OR (thong thong)) dan than cao".
• Adding a wildcard symbol may retrieve word variants: theo chu sach - ((thanh trung) or (hanh trinh)) cua ((thong cong) OR (thong thong)) dan than cao*.