Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
mai khoa » tai khoa, may khoa, dai khoa
cau tren » cu tren, dau tren, ca tren
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va danh » va dinh, va dan, va hanh
vai cau » va cau, van cau, vai cac
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sach ty)) sang ((mai hoi) or (mai khoa)). hieu ve cham soc va danh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) sang ((mai hoi) OR (mai khoa)). hieu ve cham soc va danh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sach ty)) sang ((mai hoi) or (mai khoa)). hieu ve cham soc va danh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sach ty)) sang ((mai hoi) or (mai khoa)). hieu ve cham soc va danh vai cau tren*.