Perhaps you should try some spelling variations:
dung doi » huong doi, dung tai, dung co
su sach » vu sach
ve cham » va cham, ve chat, vu cham
doi cua » dai cua, hoi cua, dong cua
xa dung » xay dung, xa dong, va dung
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
ve cam » ve cac, va cam, ve cai

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

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