Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hoc sach » hoc sinh, hoc cac, hoc anh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
va nam » ha nam, va nay
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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