Perhaps you should try some spelling variations:
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
qua cam » qua cham, qua cac, qua ca
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (nang ma)) hoi. hieu qua cam duc ban hanh vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (nang ma)) hoi. hieu qua cam duc ban hanh vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (nang ma)) hoi. hieu qua cam duc ban hanh vi ((cua te) or (cua tu))*.