Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
dua ban » dia ban, cua ban, qua ban
cuc ban » cua ban, cac ban, cuu ban
sai ky » sac ky
va cam » va cham, va cac, va cao
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) or (sai ky)) nang xa hoi. hieu va cam ((dua ban) or (cuc ban)) thanh de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sai ky)) nang xa hoi. hieu va cam ((dua ban) OR (cuc ban)) thanh de cua viet.
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) or (sai ky)) nang xa hoi. hieu va cam ((dua ban) or (cuc ban)) thanh de cua viet*.