Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hoc truc » hoc thuc, hoc trung, hoc thuoc
so sach » so sanh, bo sach, co sach
danh vi » hanh vi, dinh vi, danh di
xa danh » va danh, dia danh, nam danh
hoc tuc » hoc thuc, hoc tu, hoc duc
sang ma » tang ma, nang ma, sang tao
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((nang x) or (sang ma)) hoi. hieu van ((hoc tuc) OR (hoc truc)) xa danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang x) OR (sang ma)) hoi. hieu van ((hoc tuc) OR (hoc truc)) xa danh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((nang x) or (sang ma)) hoi. hieu van ((hoc tuc) OR (hoc truc)) xa danh vi cua tre*".