Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » hoc sach, doc sach, thuoc sach
thuoc va » thuc va, thuoc ma, thuong va
cau treo » cau theo, cau tren, cau triet
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sach ky » sac ky, sach y, sach ty
dan vai » dan tai, den vai, dang van
dan vat » dang vat, van vat, dan dat
va nam » van nam, ha nam, va nay
dan va » doan va, dan ca, ban va

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