Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
tinh tri » minh tri, chinh tri, tinh thai
dinh tri » chinh tri
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (thuat lanh)) ky nang x hoi. hieu ve cac nuoc va ((tinh tri) OR (dinh tri)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (thuat lanh)) ky nang x hoi. hieu ve cac nuoc va ((tinh tri) OR (dinh tri)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (thuat lanh)) ky nang x hoi. hieu ve cac nuoc va ((tinh tri) OR (dinh tri)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (thuat lanh)) ky nang x hoi. hieu ve cac nuoc va ((tinh tri) OR (dinh tri)) cuu tre*.