Perhaps you should try some spelling variations:
da phuong » dia phuong, dan phuong, day phuong
xa huong » xa phuong, va huong, xa muong
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
cham tu » pham tu, cam tu, chai tu
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
cua tre » cua te, cuu tre, cua triet

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 ((cao hoi) OR (cao hoc)). hieu ve cham tu ((xa huong) or (da phuong)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cham tu ((xa huong) OR (da phuong)) doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cham tu ((xa huong) or (da phuong)) doi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cham tu ((xa huong) or (da phuong)) doi cua tre*.