Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
nang xa » lang xa, nang ma, mang xa
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
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: vu sac ky ((nang xa) or (nang x)) hoi. hieu vien bach ((xuc va) OR (luc va)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky ((nang xa) OR (nang x)) hoi. hieu vien bach ((xuc va) OR (luc va)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky ((nang xa) or (nang x)) hoi. hieu vien bach ((xuc va) OR (luc va)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sac ky ((nang xa) or (nang x)) hoi. hieu vien bach ((xuc va) OR (luc va)) hanh vi cua te*.