Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
dum cua » duy cua, dam cua, dung cua
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
ang xa » lang xa, mang xa, dang xay
du cua » duy cua, dau cua, hu cua
ty ang » ty xang, ty hang, ty anh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty ang xa hoi. hieu va cau luc ((van hanh) or (ban hanh)) ((du cua) or (dum cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ang xa hoi. hieu va cau luc ((van hanh) OR (ban hanh)) ((du cua) OR (dum cua)) te.
• Adding a wildcard symbol may retrieve word variants: so sach ty ang xa hoi. hieu va cau luc ((van hanh) or (ban hanh)) ((du cua) or (dum cua)) te*.