Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van hac » van hoc, van ha, van hai
truc va » thuc va, trung va
danh du » danh dau, danh tu, dinh du
cua tre » cua te, cuu tre, cua triet
du cua » duy cua, dau cua, dum cua

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