Perhaps you should try some spelling variations:
chiet tach » chieu sach
hoc chiet » hoc thiet, hoc nhiet, hoc hien
manh dung » manh hung, manh tung, anh dung
cua nhung » va nhung
thong van » thong va, thong quan, truong van
trong van » trong cac
dung cua » dung luan, dung cho
toan cau » toan cao, toan ban, toan tap

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 - manh dung cua nhung ((thong van) or (trong van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - manh dung cua nhung ((thong van) OR (trong van)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - manh dung cua nhung ((thong van) or (trong van)) toan cau*.