Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
sach thu » sach thieu, sach tham, cach thuc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
va cham » va chat, va tham
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
va hoa » van hoa, va hoc, ma hoa

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 thu) or (sach thue)) tang ma hoi. hieu ((va cham) or (va cac)) tuc va hanh va hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (sach thue)) tang ma hoi. hieu ((va cham) OR (va cac)) tuc va hanh va hoa viet.
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (sach thue)) tang ma hoi. hieu ((va cham) or (va cac)) tuc va hanh va hoa viet*.