Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
va trien » va truyen, va thiet, va tuyen
cuc ban » cua ban, cac ban, cuu ban
cac cuc » cac cuoc, cac cua, cac nuoc
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
hai va » hai van, thai va, hoi va

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 ky) or (sai ky)) ((nang xa) OR (lang xa)) hoi. hieu va cac cuc ban thanh hai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sai ky)) ((nang xa) OR (lang xa)) hoi. hieu va cac cuc ban thanh hai va trien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sai ky)) ((nang xa) OR (lang xa)) hoi. hieu va cac cuc ban thanh hai va trien*".