Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
thanh va » thanh van, hanh va, thanh ha
ve cham » va cham, ve chat, vu cham
tuc ban » thuc ban, truc ban, tu ban
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
ve cam » ve cac, va cam, ve cai

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

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