Perhaps you should try some spelling variations:
xa truong » cac truong
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
doi cua » hoi cua
nang o » nang co, nang ho, nang ro
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: so sach ty nang o hoi. hieu va cac tuc xa truong ((doi cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang o hoi. hieu va cac tuc xa truong ((doi cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang o hoi. hieu va cac tuc xa truong ((doi cua) OR (dai cua)) tre*.