Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cac dac » cac dan, cac dai, cac bac
dau thi » cau thi, dan thi, dao thi
thi cuc » tai cuc
cuc tre » duc tre, cua tre, cuu tre
dac va » duc va, day va, dat va
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) ty nang xa hoi. lieu va cac dac va dau thi cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ty nang xa hoi. lieu va cac dac va dau thi cuc tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ty nang xa hoi. lieu va cac dac va dau thi cuc tre*.