Perhaps you should try some spelling variations:
dang thai » dang thi, dang hai, dang khai
doc sach » hoc sach, toc sach, nuoc sach
dang xay » dang van, van xay
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
thuc va » thuc vat, thuc dan, thuc day
va dang » van dang, va nang, va lang
va cam » va cham, va cao, va cai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach ky dang xay hoi. hieu ((va cam) OR (va cac)) thuc va dang thai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ky dang xay hoi. hieu ((va cam) OR (va cac)) thuc va dang thai cua te".
• Adding a wildcard symbol may retrieve word variants: doc sach ky dang xay hoi. hieu ((va cam) OR (va cac)) thuc va dang thai cua te*.