Perhaps you should try some spelling variations:
dau truc » cau truc, doan truc, dau tu
dai truc » dai thuc, doan truc, dai trung
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
doi cuu » doi cua, doi cuoc
cuu tre » cua tre, cau tren, cau treo

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 xa hoi. lieu va ((dau truc) or (dai truc)) van hanh doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. lieu va ((dau truc) OR (dai truc)) van hanh doi cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. lieu va ((dau truc) or (dai truc)) van hanh doi cuu tre*.