Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
nang xa » lang xa, nang ma, mang xa
hieu vu » hieu va, hieu ve, hieu su
cam duc » cam xuc, cao duc, pham duc
van tai » von tai, van tuan
vu cam » vu cham, vu cao, va cam
tai va » thai va, mai va, tri va
thiet » thieu

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) or (sach y)) ((nang xa) or (nang x)) hoi. hieu vu cam duc va van tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((nang xa) OR (nang x)) hoi. hieu vu cam duc va van tai va thiet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) ((nang xa) or (nang x)) hoi. hieu vu cam duc va van tai va thiet*.