Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thien van » thi van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
va dang » van dang, va nang, va lang

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 tang) OR (ky dang)) xa hoi. thien van cac nuoc va dang ((dai cua) or (tri cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ky tang) OR (ky dang)) xa hoi. thien van cac nuoc va dang ((dai cua) OR (tri cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ky tang) OR (ky dang)) xa hoi. thien van cac nuoc va dang ((dai cua) or (tri cua)) te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ky tang) OR (ky dang)) xa hoi. thien van cac nuoc va dang ((dai cua) or (tri cua)) te*.