Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh doi » thanh loi, thanh moi, thanh do
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
ly nang » ky nang, ly hang, ly vang
cam hoc » cao hoc, am hoc, cam hoa
doi cua » dai cua, hoi cua
y nang » ky nang, v nang, may nang
va cam » va cham, va cac, va cao
cua su » qua su

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