Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
tu triet » su triet, tu thiet, tu trien
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ky) or (sach ty)) nang x hoi. lieu va cham luc van hanh tai tu triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach ty)) nang x hoi. lieu va cham luc van hanh tai tu triet.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach ty)) nang x hoi. lieu va cham luc van hanh tai tu triet*.