Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh trong » hanh trang, anh trong, hinh trong
phat nhung » phai nhuong, thuat nhung, tham nhung
pha nhung » phai nhuong, tham nhung, phan chung
ho chieu » theo chieu, hoc thieu, doi chieu
dan than » dan chan, ban than, van than

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 trong ((phat nhung) OR (pha nhung)) phuong ((dan than) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - hanh trong ((phat nhung) OR (pha nhung)) phuong ((dan than) OR (tinh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh trong ((phat nhung) OR (pha nhung)) phuong ((dan than) or (tinh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh trong ((phat nhung) OR (pha nhung)) phuong ((dan than) or (tinh toan)) cau*.