Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
xang xa » lang xa, mang xa, ang xa
co viet » so viet, o viet, hoc viet
loc va » hoc va, luc va
va co » vo co

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) or (thuoc sach)) ty xang xa hoi. hieu ve cham ((duc va) or (loc va)) hanh va co viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ty xang xa hoi. hieu ve cham ((duc va) OR (loc va)) hanh va co viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ty xang xa hoi. hieu ve cham ((duc va) or (loc va)) hanh va co viet*.