Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
danh de » hanh de, dan de, dang de
va danh » va dinh, va dan, va hanh
cao suc » cao su, cao duc
qua cao » qua cac, qua ca, qua cai
cua tre » cua te, cuu tre, cua triet
suc va » duc va, tuc va, luc va
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 ty) OR (sach y)) nang ((x hoi) or (o hoi)). hieu qua cao suc va danh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ((x hoi) OR (o hoi)). hieu qua cao suc va danh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang ((x hoi) or (o hoi)). hieu qua cao suc va danh de cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang ((x hoi) or (o hoi)). hieu qua cao suc va danh de cua tre*.