Perhaps you should try some spelling variations:
sach kem » hanh kem
ban hang » ngan hang
vai cuu » vai cua
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
sac ky » cac ky, sai ky
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: te ((sach kem) or (sac ky)) tang ma hoa. hieu ve cam duc ((ban hanh) or (ban hang)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach kem) OR (sac ky)) tang ma hoa. hieu ve cam duc ((ban hanh) OR (ban hang)) vai cuu tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach kem) or (sac ky)) tang ma hoa. hieu ve cam duc ((ban hanh) or (ban hang)) vai cuu tre*.