Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
hanh di » hanh vi, hanh de, danh di
hang di » hang doi, hang vi, hang dien
cuu tre » cua tre, cau tren, cau treo
va dau » va dao

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 (ky nang)) xa hoi. lieu va dau tuc van ((hanh di) or (hang di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. lieu va dau tuc van ((hanh di) OR (hang di)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ky nang)) xa hoi. lieu va dau tuc van ((hanh di) or (hang di)) cuu tre*".