Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
te sach » toc sach
va dinh » van dinh, va kinh, vu dinh
nang xa » lang xa, nang ma, mang xa
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
sach ky » sac ky, sach y, sach ty
cac lo » cac lop, cac co, cac bo
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: te sach ky ((nang xa) OR (nang x)) hoi. hieu vien cac lo ((va dinh) or (va tinh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang x)) hoi. hieu vien cac lo ((va dinh) OR (va tinh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) OR (nang x)) hoi. hieu vien cac lo ((va dinh) or (va tinh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) OR (nang x)) hoi. hieu vien cac lo ((va dinh) or (va tinh)) vai cua te*.