Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ve cac » va cac
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) duc va dan vi ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu ((ve cac) OR (vien cac)) duc va dan vi ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) duc va dan vi ((cua te) or (cua tu))*.