Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su tien, ve triet
thanh ha » thanh hoa, thanh hai, nhanh ha
su sach » so sach, vu sach
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
su viet » so viet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (nang ma)) hoi. hieu ve cam tuc ban thanh ha ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cam tuc ban thanh ha ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang ma)) hoi. hieu ve cam tuc ban thanh ha ((su triet) or (su viet))*.