Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sang tao » hang tai
cau tren » cu tren, dau tren, ca tren
tao hoi » tao khoi, tao boi, tay hoi
van dat » van dao, van dan, van dam
van dau » van dao, phan dau
dan dat » dung dat, dong dat, dinh dat
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
y sang » _ sang, duy sang
vi cau » va cau, ve cau, di cau
nuoc » quoc, duoc, ngoc

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 y sang tao hoi. hieu ((((van dat) OR (van dau))) or (dan dat)) nuoc va danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y sang tao hoi. hieu ((((van dat) OR (van dau))) OR (dan dat)) nuoc va danh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y sang tao hoi. hieu ((((van dat) OR (van dau))) or (dan dat)) nuoc va danh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: toc sach y sang tao hoi. hieu ((((van dat) OR (van dau))) or (dan dat)) nuoc va danh vi cau tren*.