Perhaps you should try some spelling variations:
su sach » so sach, vu sach
dinh tu » danh tu, dinh cu, tinh tu
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu lang
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
tu cua » hu cua, vu cua
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: su sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cac ((tuc va) or (duc va)) dinh tu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cac ((tuc va) OR (duc va)) dinh tu cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cac ((tuc va) or (duc va)) dinh tu cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) OR (ty hang)) xa hoi. hieu ve cac ((tuc va) or (duc va)) dinh tu cua te*.