Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
sang cua » mang cua, song cua, hang cua
so sach » bo sach, co sach, hoc sach
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
so sanh » do sanh
ve cam » ve cham, ve cac, va cam
lo van » vo van, so van, do van
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) OR (so sanh)) ky tang xa hoi. hieu ve cam ((lo van) or (le van)) thanh sang cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky tang xa hoi. hieu ve cam ((lo van) OR (le van)) thanh sang cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ky tang xa hoi. hieu ve cam ((lo van) or (le van)) thanh sang cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) ky tang xa hoi. hieu ve cam ((lo van) or (le van)) thanh sang cua te*.