Perhaps you should try some spelling variations:
danh dan » danh dau, canh dan, dang dan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dan cua » dan ca, ban cua, dai cua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cao
tuc va » truc va, duc va, thuc vat

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 ky lang xa hoi. hieu va cam ((((tuc va) OR (thuc va))) or (tuc xa)) danh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. hieu va cam ((((tuc va) OR (thuc va))) OR (tuc xa)) danh dan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu va cam ((((tuc va) OR (thuc va))) or (tuc xa)) danh dan cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu va cam ((((tuc va) OR (thuc va))) or (tuc xa)) danh dan cua tre*.