Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cuu tre » cua tre, cau treo
hang di » hang doi, hang vi, hang dien
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, danh di
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: vu sach ky nang xa hoi. lieu va dau tuc van ((hanh di) or (hang di)) ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. lieu va dau tuc van ((hanh di) OR (hang di)) ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. lieu va dau tuc van ((hanh di) or (hang di)) ((cuu tre) OR (cau tren))*".