Perhaps you should try some spelling variations:
bach khoa » anh khoa
khoa tang » kho tang, khoa dang, khoa tieng
thu bach » thi bach, thu sach, thu hoach
canh dan » canh van, sanh dan, thanh dan
hanh dan » thanh dan, hanh san, hanh dao
cham tuc » nham thuc, pham thuc, tham thuc
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tuc va » thuc va, truc va, tuc xa
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu bach khoa tang ((ma hoi) or (mai hoi)). hieu ve cham tuc va ((hanh dan) OR (canh dan)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu bach khoa tang ((ma hoi) OR (mai hoi)). hieu ve cham tuc va ((hanh dan) OR (canh dan)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu bach khoa tang ((ma hoi) or (mai hoi)). hieu ve cham tuc va ((hanh dan) OR (canh dan)) cua vat".
• Adding a wildcard symbol may retrieve word variants: thu bach khoa tang ((ma hoi) or (mai hoi)). hieu ve cham tuc va ((hanh dan) OR (canh dan)) cua vat*.