Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat soc » cham soc, chat hoc, chat doc
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty

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 ky nang x ho. hieu van chat soc ((van hanh) or (van thanh)) ((vi lua) OR (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. hieu van chat soc ((van hanh) OR (van thanh)) ((vi lua) OR (vi luu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x ho. hieu van chat soc ((van hanh) or (van thanh)) ((vi lua) OR (vi luu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. hieu van chat soc ((van hanh) or (van thanh)) ((vi lua) OR (vi luu)) tre*.