Perhaps you should try some spelling variations:
ban than » ban thanh, van thanh, ban hang
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
cua su » qua su
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. lieu va cac vuc van ban than ((dua tren) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. lieu va cac vuc van ban than ((dua tren) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. lieu va cac vuc van ban than ((dua tren) or (cua su))*.