Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
vien da » vien dai
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky
cua te » cua tu
hien » bien, tien, dien

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sac ky)) nang xa hoi. hieu ((vien da) OR (hien dai)) vo van hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang xa hoi. hieu ((vien da) OR (hien dai)) vo van hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang xa hoi. hieu ((vien da) OR (hien dai)) vo van hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang xa hoi. hieu ((vien da) OR (hien dai)) vo van hanh vai cua te*.