Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, ty xang, thi hang
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty hang ((ma hoi) or (mai hoi)). hieu va cham tuc va hanh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ((ma hoi) OR (mai hoi)). hieu va cham tuc va hanh vi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang ((ma hoi) or (mai hoi)). hieu va cham tuc va hanh vi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ((ma hoi) or (mai hoi)). hieu va cham tuc va hanh vi ((cua te) OR (cua tu))*.