Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham hoc » cham soc, chat hoc, cham hoi
sang cua » mang cua, song cua, hang cua
tu sach » thu sach, te sach, tu cach
ban cua » ban quan
hoc van » hoc dan, hoc va, hoc vat
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach

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 (su sach)) ky lang xa hoi. hieu vu cham hoc van thanh ((sang cua) or (ban cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang xa hoi. hieu vu cham hoc van thanh ((sang cua) OR (ban cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky lang xa hoi. hieu vu cham hoc van thanh ((sang cua) or (ban cua)) tre*".