Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
thanh tung » thanh cong
thong cong » trong cong, thong thong, phong chong
tong cong » trong cong, cong cong, dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
tac than » tac thanh, tam than, tac nhan
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: ho chieu sach - ((hanh trinh) or (thanh tung)) va ((thong cong) OR (tong cong)) tac than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - ((hanh trinh) OR (thanh tung)) va ((thong cong) OR (tong cong)) tac than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - ((hanh trinh) or (thanh tung)) va ((thong cong) OR (tong cong)) tac than cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((hanh trinh) or (thanh tung)) va ((thong cong) OR (tong cong)) tac than cao*.