Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cham luc » cham soc, nhan luc, cham cuu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, tu cach
mai hoi » dai hoi, lai hoi, mai doi
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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) or (te sach)) ty nang ((mai hoi) OR (mai khoi)). hieu ve cham luc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang ((mai hoi) OR (mai khoi)). hieu ve cham luc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ty nang ((mai hoi) OR (mai khoi)). hieu ve cham luc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty nang ((mai hoi) OR (mai khoi)). hieu ve cham luc va hanh va cua tre*.