Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, mang xa
cac luc » cau luc, coc luc, cac nuoc
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach ty, sach kem
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
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 ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu vien cac luc 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) OR (nang ma)) hoi. hieu vien cac luc 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) OR (nang ma)) hoi. hieu vien cac luc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu vien cac luc va hanh vi cua te*.