Perhaps you should try some spelling variations:
sach tham » sach nha
hoang van » hang va
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
tang van » dang van, trong 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
va hanh » van hanh, va thanh, va danh
cua cau » cua cac, cua chu, cua cay
cua su » qua su

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 tham ((tang van) or (hoang van)) hoe. hieu va tham nuoc va hanh vi ((cua su) or (cua cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tham ((tang van) OR (hoang van)) hoe. hieu va tham nuoc va hanh vi ((cua su) OR (cua cau)).
• Adding a wildcard symbol may retrieve word variants: so sach tham ((tang van) or (hoang van)) hoe. hieu va tham nuoc va hanh vi ((cua su) or (cua cau))*.