Perhaps you should try some spelling variations:
kham chua » kham pha
sach thu » sach thue, sach thieu, sach tham
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
chua va » chuc va, chua may, chuan ha
ve kham » vu kham, va kham, ve cham
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
tang ma » tang van
nang ma » sang ma, nang cao
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 thu ((nang ma) or (((tang ma) or (mang may)))) hoi. hieu ve kham chua va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu ((nang ma) OR (((tang ma) OR (mang may)))) hoi. hieu ve kham chua va hanh va cua te.
• Adding a wildcard symbol may retrieve word variants: so sach thu ((nang ma) or (((tang ma) or (mang may)))) hoi. hieu ve kham chua va hanh va cua te*.