Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
van anh » van thanh, tuan anh, van minh
cham tu » pham tu, cam tu, chai tu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
lang ha » long ha
nang xa » nang x, lang xa, nang ma
du tren » dua tren, dau tren, duc tren
vi du » vi dum, va du, ve du

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 y ((nang xa) or (lang ha)) hoi. hieu vu cham tu ((van anh) or (ban hanh)) vi du tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang xa) OR (lang ha)) hoi. hieu vu cham tu ((van anh) OR (ban hanh)) vi du tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (lang ha)) hoi. hieu vu cham tu ((van anh) or (ban hanh)) vi du tren*.