Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cham luc » cham soc, nhan luc, cham cuu
sach ky » sac ky, sach y, sach kem
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
su viet » so viet
sach ty » sach y, sach tu, sach thu
luc va » duc va, tuc va, loc va
tai su » tai so, tai tu, lai su
x hoi » o hoi, x ho, 5 hoi

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) OR (xa hoi)). lieu va cham luc va hanh tai su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach ty)) nang ((x hoi) OR (xa hoi)). lieu va cham luc va hanh tai su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach ty)) nang ((x hoi) OR (xa hoi)). lieu va cham luc va hanh tai su viet".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach ty)) nang ((x hoi) OR (xa hoi)). lieu va cham luc va hanh tai su viet*.