Perhaps you should try some spelling variations:
thanh ban » thanh san, thanh van, thanh bac
thuc dan » thuc hanh, hoc dan, thuc vat
sach yu » sach y, sach tu, sach xu
ban cua » ban quan
thuc va » thuc vat, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
sach uu » sach luu, sach tu, sach xu
pang o » lang o, tang o, dang o
ve nam » he nam, va nam, le nam
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: thu ((sach yu) OR (sach uu)) pang o hoi. hieu ve nam ((thuc va) or (thuc dan)) thanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach yu) OR (sach uu)) pang o hoi. hieu ve nam ((thuc va) OR (thuc dan)) thanh ban cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach yu) OR (sach uu)) pang o hoi. hieu ve nam ((thuc va) or (thuc dan)) thanh ban cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach yu) OR (sach uu)) pang o hoi. hieu ve nam ((thuc va) or (thuc dan)) thanh ban cua tre*.