Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
nhanh lang » nhanh quang, nhanh thang, nhan dang
nhung vung » nhung dung, nhung huong, nhung tuong
hien sach » dien sach, kien sach, chieu sach
cua nhung » va nhung
lang cua » mang cua, hang cua, long cua
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) or (thien hach)) - nhanh lang cua nhung vung ((dan toan) OR (van toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (thien hach)) - nhanh lang cua nhung vung ((dan toan) OR (van toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) or (thien hach)) - nhanh lang cua nhung vung ((dan toan) OR (van toan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) or (thien hach)) - nhanh lang cua nhung vung ((dan toan) OR (van toan)) tap*.