Perhaps you should try some spelling variations:
chiet tach » chieu sach
nhung dung » phuong dung, ung dung, thong dung
thong cong » trong cong, tong cong, thong thong
hoc chiet » hoc thiet, hoc nhiet, hoc hien
hanh sinh » hanh tinh, hanh dinh, hinh sinh
sinh va » sinh vat, tinh va, dinh van
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang ban, van 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 chiet tach - hanh sinh va ((nhung dung) or (thong cong)) van tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - hanh sinh va ((nhung dung) OR (thong cong)) van tan ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - hanh sinh va ((nhung dung) or (thong cong)) van tan ban*.