Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
vai cuu » vai cua
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
ty hang » ly hang, thi hang, thu hang
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam
va dan » ca dan, va dao, va dap
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty xang) or (ty hang)) xa hoi. hieu ve cam tuc ((va dan) OR (va dau)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty xang) OR (ty hang)) xa hoi. hieu ve cam tuc ((va dan) OR (va dau)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty xang) or (ty hang)) xa hoi. hieu ve cam tuc ((va dan) OR (va dau)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty xang) or (ty hang)) xa hoi. hieu ve cam tuc ((va dan) OR (va dau)) vai cuu tre*.