Perhaps you should try some spelling variations:
van cham » van chat, van tham, van pham
hanh tri » thanh tri, hanh tai, hanh trinh
sach ky » sach y, sach ty, sach kem
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
soc va » hoc va, loc va, doc va
x hoi » xa hoi, o hoi, x ho
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: tu ((sach ky) or (sac ky)) nang x hoi. hieu ((van cham) or (va cham)) soc va hanh tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang x hoi. hieu ((van cham) OR (va cham)) soc va hanh tri va thiet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang x hoi. hieu ((van cham) or (va cham)) soc va hanh tri va thiet*.