Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
anh giao » nang giao, minh giao, danh gia
anh giau » canh giac, anh giang, danh giao
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac lo van ((anh giau) or (anh giao)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac lo van ((anh giau) OR (anh giao)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac lo van ((anh giau) or (anh giao)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac lo van ((anh giau) or (anh giao)) cua tre*.