Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh viet » anh viet, ninh viet, nang viet
dang xay » dang van, van xay
viet cac » vien cac, viet ca, viet bac
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
qua ca » qua cac, qua cua, qua cai

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 ky ((lang xa) or (dang xay)) hoi. hieu qua ca ((truc va) or (thuc va)) danh viet cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((lang xa) OR (dang xay)) hoi. hieu qua ca ((truc va) OR (thuc va)) danh viet cac tro.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((lang xa) or (dang xay)) hoi. hieu qua ca ((truc va) or (thuc va)) danh viet cac tro*.