Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dan vai » dan va, dan tai, dan vat
cuu tre » cua tre, cau tren
te sach » toc sach
va dan » ca dan, va dao, va dau

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 ky dang xay hoi. hieu van ((nam thuc) or (nha thuoc)) va dan vai ((cuu tre) OR (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang xay hoi. hieu van ((nam thuc) OR (nha thuoc)) va dan vai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang xay hoi. hieu van ((nam thuc) or (nha thuoc)) va dan vai ((cuu tre) OR (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang xay hoi. hieu van ((nam thuc) or (nha thuoc)) va dan vai ((cuu tre) OR (cau treo))*.