Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ly nang
ty hang » ly hang, ty xang, thi hang
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
luu tre » luu tru, cuu tre, luy tre
va dau » va dao
vi luu » vi lua

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 hang)) xa hoi. lieu va dau tuc van hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) xa hoi. lieu va dau tuc van hanh vi luu tre*.