Perhaps you should try some spelling variations:
thuan anh » tuan anh, thuan thanh, thuat lanh
duc thuan » duc tan, duc thang, duc phan
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
anh ve » hanh ve, anh va, anh viet
ve cua » le cua, de cua, te cua
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: ((toc sach) OR (hoc sach)) ty nang o hoi. ((hieu ve) or (lieu va)) pham duc thuan anh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ty nang o hoi. ((hieu ve) OR (lieu va)) pham duc thuan anh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ty nang o hoi. ((hieu ve) or (lieu va)) pham duc thuan anh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ty nang o hoi. ((hieu ve) or (lieu va)) pham duc thuan anh ve cua tre*.