Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
xuc ban » duc ban, cuc ban, quoc ban
hanh ki » hanh ky, hanh kien, thanh kim
so viet » hoc viet
va cao » va cac, va co, 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 _ lang xa hoi. hieu va cao ((xuc van) or (xuc ban)) ((hanh ki) or (hanh vi)) so viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ lang xa hoi. hieu va cao ((xuc van) OR (xuc ban)) ((hanh ki) OR (hanh vi)) so viet.
• Adding a wildcard symbol may retrieve word variants: tu sach _ lang xa hoi. hieu va cao ((xuc van) or (xuc ban)) ((hanh ki) or (hanh vi)) so viet*.