Perhaps you should try some spelling variations:
dung doi » huong doi, dung tai, dung co
doi cua » dai cua, hoi cua
xa dung » xay dung, xa dong, va dung
hieu va » lieu va, hieu qua
co sach » bo sach, cuon sach, hoc sach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam te » cam tu, cam tien
te xa » te va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (so sanh)) ((ky lang) OR (ky tang)) xa hoi. hieu va cam te xa dung doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (so sanh)) ((ky lang) OR (ky tang)) xa hoi. hieu va cam te xa dung doi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (so sanh)) ((ky lang) OR (ky tang)) xa hoi. hieu va cam te xa dung doi cua tre*".