Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
nam thuc » am thuc, nam thu, nam tu
dan vat » dang vat, van vat, dan va
dan vai » dan va, dan tai, den vai
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky dang xay hoi. hieu va ((nam thuc) or (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. hieu va ((nam thuc) OR (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xay hoi. hieu va ((nam thuc) or (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. hieu va ((nam thuc) or (nam thuoc)) va ((dan vai) OR (dan vat)) cua tre*.