Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
cac duc » cac du, cao duc, cac dac
sach ly » sach y, sach lo, sach ty
hieu va » lieu va
nang xa » lang xa, nang ma, mang xa
di cua » dai cua, doi cua, de cua
cua te » cua tu

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