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