Perhaps you should try some spelling variations:
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
dang xa » dang xay, lang xa, dang ha
tai cua » thai cua, tai cuc, tri cua
nam tu » nam thu, nam thuc
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: ((toc sach) or (hoc sach)) _ dang xa hoi. hieu van nam tu ((ban hanh) or (van hanh)) tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) _ dang xa hoi. hieu van nam tu ((ban hanh) OR (van hanh)) tai cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) _ dang xa hoi. hieu van nam tu ((ban hanh) or (van hanh)) tai cua te*.