Perhaps you should try some spelling variations:
nham nang » phap nang, cam nang, kha nang
sach nham » sach nha, sach tham, sach han
su triet » su viet, su tien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
ma hoi » xa hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
kem » kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach nham nang ((ma hoi) or (mai hoi)). hieu ((ve cam) or (va cac)) luc va hanh kem su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach nham nang ((ma hoi) OR (mai hoi)). hieu ((ve cam) OR (va cac)) luc va hanh kem su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach nham nang ((ma hoi) or (mai hoi)). hieu ((ve cam) or (va cac)) luc va hanh kem su triet*.