Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
xa truong » cac truong
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
hieu va » lieu va, hieu qua
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc
tu xa » tu xay, tu va, te xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tu nang ((o hoi) OR (o hoc)). hieu va cac tu xa truong doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu nang ((o hoi) OR (o hoc)). hieu va cac tu xa truong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu nang ((o hoi) OR (o hoc)). hieu va cac tu xa truong doi cua tre*.