Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
cam duc » cam xuc, cao duc, pham duc
hanh de » hanh ve, hanh kem
hang di » hang doi, hang vi, hang dien
su viet » so viet
sac ky » cac ky, sai ky
co hai » co dai, co hoi, so hai
va cam » va cham, va cac, va cao
o hai » so hai, o lai, _ hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky nang ((o hai) or (co hai)). lieu va cam duc va ((hanh de) or (hang di)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang ((o hai) OR (co hai)). lieu va cam duc va ((hanh de) OR (hang di)) su viet.
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang ((o hai) or (co hai)). lieu va cam duc va ((hanh de) or (hang di)) su viet*.