Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung dung » phuong dung, ung dung, thong dung
thong cong » trong cong, tong cong, thong thong
hoc chieu » hoc thieu, ho chieu, hoc hien
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh va » sinh vat, tinh va, dinh van
tan ban » toan ban, tang ban, can ban

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

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