Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cau tren » cu tren, dau tren, ca tren
dang tay » dang xay, dung tay, dan tay
tay hoi » tay ho, tao hoi, tay thai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
y dang » ky dang, 2 dang, _ dang
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (thuoc sach)) y dang tay hoi. hieu van cham soc ((va hanh) or (va danh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) y dang tay hoi. hieu van cham soc ((va hanh) OR (va danh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) y dang tay hoi. hieu van cham soc ((va hanh) or (va danh)) vi cau tren*.