Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
chieu sach » chinh sach, chiet tach, chieu sang
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
tinh cua » trinh cua, sinh cua, tinh chat
dan toan » van toan, manh toan, xuan toan
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: hoc ((chieu sach) or (thien thanh)) - nhanh tinh cua nhung cong ((dan toan) or (dan than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (thien thanh)) - nhanh tinh cua nhung cong ((dan toan) OR (dan than)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (thien thanh)) - nhanh tinh cua nhung cong ((dan toan) or (dan than)) cao*.