Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
thi van » thi lan, thi hanh, thi nang
xuc ban » duc ban, cuc ban, quoc ban
benh li » benh ly, benh lo, benh vi
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
li cua » lai cua, le cua, ly cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (mai hoi)). thi van nam ((xuc ban) OR (duc tan)) benh li cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) OR (mai hoi)). thi van nam ((xuc ban) or (duc tan)) benh li cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) OR (mai hoi)). thi van nam ((xuc ban) or (duc tan)) benh li cua tre*.