Perhaps you should try some spelling variations:
kham chua » kham pha
sach thue » sach thu, sach thieu, sach tham
thue ban » thu ban, thuc ban, thuat ban
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ban ma » ban va
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thue ban ma hoi. hieu ve ((kham chua) or (pham duc)) va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thue ban ma hoi. hieu ve ((kham chua) OR (pham duc)) va hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: so sach thue ban ma hoi. hieu ve ((kham chua) or (pham duc)) va hanh va cua te*.