Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham hoc » cham soc, chat hoc, cham hoi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu vu » hieu va, hieu ve, dieu vu
hieu su » hieu sau, tieu su, hieu so
hoc van » hoc dan, hoc va, hoc vat
san cua » sang cua, dan cua, nan cua
ban cua » ban quan

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