Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham tuc » nham thuc, pham thuc, tham thuc
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
xa danh » va danh, dia danh, nam danh
danh vi » hanh vi, dinh vi, danh di
v nang » va nang, vu nang, van nang
vi va » vi van, vai va, vu va
thiet* » thieu*

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) OR (toc sach)) v nang xa hoi. ((hieu ve) or (lieu va)) cham tuc xa danh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang xa hoi. ((hieu ve) OR (lieu va)) cham tuc xa danh vi va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v nang xa hoi. ((hieu ve) or (lieu va)) cham tuc xa danh vi va thiet*".