Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
tinh van » trinh van, dinh van, tinh va
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va
sach ly » sach y, sach lo, sach ty
cac duc » cac du, cao duc, cac dac
va tinh » may tinh
ly hang » ly quang
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, chang xu

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 ly hang x ho. ((hieu ve) OR (hieu van)) cac duc va tinh van ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ly hang x ho. ((hieu ve) OR (hieu van)) cac duc va tinh van ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ly hang x ho. ((hieu ve) OR (hieu van)) cac duc va tinh van ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ly hang x ho. ((hieu ve) OR (hieu van)) cac duc va tinh van ((cua tre) or (cau tren))*.