Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
thuc day » thuc dan, thuc vat
nano bac » tao bac, bang bac, dan bac
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
nano xa » nano va, nano cau, nano dua
va do » va dao, va doc, va co

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu ((nano xa) OR (nano bac)) hoi. hieu va do ((thuc va) or (thuc day)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ((nano xa) OR (nano bac)) hoi. hieu va do ((thuc va) OR (thuc day)) danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ((nano xa) OR (nano bac)) hoi. hieu va do ((thuc va) or (thuc day)) danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu ((nano xa) OR (nano bac)) hoi. hieu va do ((thuc va) or (thuc day)) danh vai cua tre*.