Perhaps you should try some spelling variations:
vien chao » vien cao, vien cheo, vien cac
vien cho » vien cheo, viec cho, vien cao
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
vi cua » vai cua, di cua
cua te » cua tu
xu va » xu van, tu va, su 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 (sach y)) nang xa hoi. hieu ((vien chao) OR (vien cho)) xu va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. hieu ((vien chao) OR (vien cho)) xu va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang xa hoi. hieu ((vien chao) OR (vien cho)) xu va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang xa hoi. hieu ((vien chao) OR (vien cho)) xu va hanh vi cua te*.