Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
ve triet » va trien, su triet
dong hoc » dong co, dong luc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hoc hoi » hoc khoi, hoc hoa, hoc noi
ky dong » ly dong, ky dang, ky cong
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
vu ve » vu le, vu va, su ve

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dong hoc hoi. hieu ((ve cam) OR (va cam)) luc ((van thanh) or (ban thanh)) vu ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dong hoc hoi. hieu ((ve cam) OR (va cam)) luc ((van thanh) OR (ban thanh)) vu ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dong hoc hoi. hieu ((ve cam) OR (va cam)) luc ((van thanh) or (ban thanh)) vu ve triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky dong hoc hoi. hieu ((ve cam) OR (va cam)) luc ((van thanh) or (ban thanh)) vu ve triet*.