Perhaps you should try some spelling variations:
truong doi » truong dai, trong doi, truong hoi
xa truong » cac truong
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
cam tuc » cam xuc, cam tu, dam thuc
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
co hoi » co hoc, co loi
o hoi » o hoc, o hai, o hoa

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 ty nang ((o hoi) OR (co hoi)). hieu va ((cam tuc) or (nam thuc)) xa truong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang ((o hoi) OR (co hoi)). hieu va ((cam tuc) OR (nam thuc)) xa truong doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ((o hoi) OR (co hoi)). hieu va ((cam tuc) or (nam thuc)) xa truong doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ((o hoi) OR (co hoi)). hieu va ((cam tuc) or (nam thuc)) xa truong doi cua tre*.