Perhaps you should try some spelling variations:
doc sach » toc sach, nuoc sach, dac sac
hoc sach » hoc sinh, hoc cac, hoc anh
cham hoc » cham soc, chat hoc, cham hoi
dan sinh » dang sinh, doan sinh, van sinh
dua tren » dung tren
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
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: ((doc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham hoc dan sinh vien ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham hoc dan sinh vien ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham hoc dan sinh vien ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (hoc sach)) ky nang xa hoi. lieu va cham hoc dan sinh vien ((dua tren) or (cua te))*.