Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trung tuan » trung thanh, trung tam, tran tuan
trung cua » truong cua, trung cap, dung cua
tranh cua » doanh cua, manh cua
ho chieu » theo chieu, hoc thieu, doi chieu
trong ca » trong cac, trong nha
toan cao » toan ban, toan tap
ca toan » cua toan, va toan, bai toan

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 ((((trung cua) OR (trung tuan))) or (tranh cua)) dung trong ca toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh ((((trung cua) OR (trung tuan))) OR (tranh cua)) dung trong ca toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((((trung cua) OR (trung tuan))) or (tranh cua)) dung trong ca toan cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((((trung cua) OR (trung tuan))) or (tranh cua)) dung trong ca toan cao*.