Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu viec » nhieu viec, hieu ve, sieu viet
dinh moi » dinh so, dinh tri, dinh thi
tai nuoc » tai quoc, thi nuoc, tham nuoc
viec tai » vien tai, lieu tai, viec lam
moi cua » hoi cua, doi cua, moi quan
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu viec tai nuoc va dinh moi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) ((nang xa) OR (nang ma)) hoi. hieu viec tai nuoc va dinh moi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu viec tai nuoc va dinh moi cua triet".
• Adding a wildcard symbol may retrieve word variants: so ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu viec tai nuoc va dinh moi cua triet*.