Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
vuc nang » cuc nang, vu nang, van nang
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
hang doi » hang loi, huong doi, hang tai
co sach » bo sach, cuon sach, hoc sach
hang di » hang vi, hang dien, hang dich
cua te » cua tu
chuc » thuc, chu, chua

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ((vuc nang) OR (chuc nang)) xa hoi. hieu van tham nuoc va ((hang di) or (hang doi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((vuc nang) OR (chuc nang)) xa hoi. hieu van tham nuoc va ((hang di) OR (hang doi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((vuc nang) OR (chuc nang)) xa hoi. hieu van tham nuoc va ((hang di) or (hang doi)) cua te".
• Adding a wildcard symbol may retrieve word variants: co sach ((vuc nang) OR (chuc nang)) xa hoi. hieu van tham nuoc va ((hang di) or (hang doi)) cua te*.