Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
ky dang » ky danh
van lam » van nam
van cau » van dau, van hau, van chat
dan vai » dan va, dan tai, dan vat
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
loc va » hoc va, luc va
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ((ky dang) OR (ky nang)) xa hoi. hieu ((van lam) or (van cau)) loc va dan vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ky dang) OR (ky nang)) xa hoi. hieu ((van lam) OR (van cau)) loc va dan vai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ky dang) OR (ky nang)) xa hoi. hieu ((van lam) or (van cau)) loc va dan vai cuu tre*".