Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang thai » dang thi, dang hai, dang khai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va dang » van dang, va nang, va lang
cua tuc » cua duc, cua tu, cua thuoc
y sang » duy sang
_ sang » _ san
ma hoi » mai hoi, xa hoi, ma hoa
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: thuat sach ((y sang) OR (_ sang)) ma hoi. lieu va cac nuoc va dang thai ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y sang) OR (_ sang)) ma hoi. lieu va cac nuoc va dang thai ((cua te) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y sang) OR (_ sang)) ma hoi. lieu va cac nuoc va dang thai ((cua te) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y sang) OR (_ sang)) ma hoi. lieu va cac nuoc va dang thai ((cua te) or (cua tuc))*.