Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
tu van » tu va
vi su » va su, ve su, ki su

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) or (hoc sinh)) ky nang xa hoi. lieu va cam tu van hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sinh)) ky nang xa hoi. lieu va cam tu van hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sinh)) ky nang xa hoi. lieu va cam tu van hanh vi su tien*.