Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
canh giac » danh gia, canh tac
hieu vien » hieu hien, hieu viec, thieu nien
anh giao » nang giao, minh giao, danh gia
vien cac » vien bach, vien dai, vien da
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
cac bo » bac bo, cac co
bo van » vo van, so van, do van
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky nang xa hoi. hieu vien cac bo van ((canh giac) OR (anh giao)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang xa hoi. hieu vien cac bo van ((canh giac) OR (anh giao)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sac ky nang xa hoi. hieu vien cac bo van ((canh giac) OR (anh giao)) ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang xa hoi. hieu vien cac bo van ((canh giac) OR (anh giao)) ((cua tre) or (cuu tre))*.