Perhaps you should try some spelling variations:
ngoc ngoc » ngo ngoc, loc ngoc
dieu tra » dieu tri, kiem tra, dieu cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va ngoc » van ngoc, vu ngoc, ma ngoc
tra tre » tran tren, tran tri, tran tro
va dan » ca dan, va dao, va dau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. lieu va ngoc ngoc ((va dan) OR (cac dan)) dieu tra tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. lieu va ngoc ngoc ((va dan) or (cac dan)) dieu tra tre*.