Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang hai » dang khai, hang hai, dung hai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
dai hoi » dai hoc, dai hai, dai moi
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
va dang » van dang, va nang, va lang
cua tuc » cua duc, cua tu, cua thuoc
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 ky nang ((ma hoi) OR (dai hoi)). hieu van cac nuoc va dang hai ((cua te) OR (cua tuc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) OR (dai hoi)). hieu van cac nuoc va dang hai ((cua te) OR (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) OR (dai hoi)). hieu van cac nuoc va dang hai ((cua te) OR (cua tuc))*.