Perhaps you should try some spelling variations:
trong van » trong cac
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
tang van » dang van, hoang van, tang luan
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
danh vi » hanh vi, danh di, danh va
dinh vi » dinh ve, dinh viet, dinh tri
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thieu ((tang van) or (trong van)) hoi. hieu va tham nuoc va ((danh vi) OR (dinh vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thieu ((tang van) OR (trong van)) hoi. hieu va tham nuoc va ((danh vi) OR (dinh vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thieu ((tang van) or (trong van)) hoi. hieu va tham nuoc va ((danh vi) OR (dinh vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach thieu ((tang van) or (trong van)) hoi. hieu va tham nuoc va ((danh vi) OR (dinh vi)) cua te*.