Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
viec cac » vien cac, viec cua, viec lam
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (sach y)) ((nang xa) or (nang ma)) hoi. hieu viec cac nuoc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach y)) ((nang xa) OR (nang ma)) hoi. hieu viec cac nuoc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach y)) ((nang xa) or (nang ma)) hoi. hieu viec cac nuoc van hanh vi cua te*.