Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
cham luc » cham soc, nhan luc, cham cuu
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
hanh ly » khanh ly, hanh ky, hang ly
va hanh » van hanh, va thanh, va danh
te sach » toc sach
mai hoi » dai hoi, lai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ma hoi » xa hoi, ma hoa, me hoi
ly cua » le cua

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

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