Perhaps you should try some spelling variations:
xa truong » cac truong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
cam tuc » cam xuc, cam tu, nam thuc
doi cua » dai cua
hoi cua » hoi chuc
x hoi » xa hoi, o hoi, x ho

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