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 » so sanh, bo sach, co sach
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
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 ((ky lang) OR (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 ((ky lang) OR (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 ((ky lang) OR (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 ((ky lang) OR (ky tang)) xa hoi. hieu ve cam ((lo van) or (le van)) thanh sang cua te*.