Perhaps you should try some spelling variations:
thuoc sach » hoc sach, thuat sach, thuoc sinh
nuoc sach » nguoi sach, hoc sach, cuoc cach
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
bo van » vo van, so van, ho van
do van » dao van, vo van, so van
va cua » va chua, via cua, ca cua
ve cac » va cac, vien cac

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

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