Perhaps you should try some spelling variations:
linh kien » sinh vien, tinh dien, kinh dien
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va linh » van linh, va kinh, va tinh
kien su » nien su, tien su, vien sau
su tien » su kien, su hien, tu tieng
ve cac » vien cac
dac va » duc va, day va, dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang xa hoi. hieu ((ve cac) or (va cac)) dac va linh kien su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang xa hoi. hieu ((ve cac) OR (va cac)) dac va linh kien su tien.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. hieu ((ve cac) or (va cac)) dac va linh kien su tien*.