Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
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: thuoc sach ((ky lang) or (ky tang)) mai hoi. hieu ve cham soc ((va danh) OR (va dinh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((ky lang) OR (ky tang)) mai hoi. hieu ve cham soc ((va danh) OR (va dinh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((ky lang) or (ky tang)) mai hoi. hieu ve cham soc ((va danh) OR (va dinh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((ky lang) or (ky tang)) mai hoi. hieu ve cham soc ((va danh) OR (va dinh)) vi cua te*.