Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
sang mai » sang ma, sang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
vu kham » vu khanh
vu cham » va cham, tu cham, qua cham
vi cua » vai cua, di 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: tu ((sach hoi) or (sach y)) sang mai khoi. hieu ((vu cham) OR (vu kham)) hoc va danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoi) OR (sach y)) sang mai khoi. hieu ((vu cham) OR (vu kham)) hoc va danh vi cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach hoi) or (sach y)) sang mai khoi. hieu ((vu cham) OR (vu kham)) hoc va danh vi cua te*".