Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cac » vien cac
lo van » le van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky lang xa hoi. hieu ((ve cac) or (va cac)) lo van ((anh va) OR (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu ((ve cac) OR (va cac)) lo van ((anh va) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang xa hoi. hieu ((ve cac) or (va cac)) lo van ((anh va) OR (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ((ve cac) or (va cac)) lo van ((anh va) OR (hanh va)) cua tre*.