Perhaps you should try some spelling variations:
dau truc » cau truc, dai truc, doan truc
van hanh » van thanh, ban hanh, van ban
su sach » so sach, vu sach
ty nang » ky nang, ty hang, ly nang
van anh » van thanh, tuan anh, van minh
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty nang) OR (ty xang)) xa hoi. lieu va dau truc ((van hanh) or (van anh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty xang)) xa hoi. lieu va dau truc ((van hanh) OR (van anh)) di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty xang)) xa hoi. lieu va dau truc ((van hanh) or (van anh)) di cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ty xang)) xa hoi. lieu va dau truc ((van hanh) or (van anh)) di cuu tre*.