Perhaps you should try some spelling variations:
cap nuoc » dat nuoc
dieu tra » dieu tri, kiem tra, dieu cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tra tre » tran tren, tran tri, tran tro
ty nang » ky nang, ty xang, ty hang
qua cap » qua cac, qua ap, qua ca
va dan » va dao, va dap, va dai
va dau » va dao
ca dan » cac dan, ca dao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang x hoi. hieu qua cap nuoc ((((va dan) or (va dau))) or (ca dan)) dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu qua cap nuoc ((((va dan) OR (va dau))) OR (ca dan)) dieu tra tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu qua cap nuoc ((((va dan) or (va dau))) or (ca dan)) dieu tra tre*.