Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham hoc » cham soc, chat hoc, cham hoi
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay
vi cau » va cau, ve cau, di cau

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 y ((lang xa) or (((lang van) OR (tang van)))) hoi. hieu vu cham hoc va danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (((lang van) OR (tang van)))) hoi. hieu vu cham hoc va danh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) or (((lang van) OR (tang van)))) hoi. hieu vu cham hoc va danh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (((lang van) OR (tang van)))) hoi. hieu vu cham hoc va danh vi cau tren*.