Perhaps you should try some spelling variations:
va chinh » tai chinh, te chinh
sach ky » sach y, sach ty, sach kem
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
cam loc » cam lo
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
loc va » hoc va, luc va

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 ky) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu va cam loc va chinh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((nang xa) OR (nang x)) hoi. hieu va cam loc va chinh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu va cam loc va chinh tri cua tre*.