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, ly nang, ty nong
ty hang » ly hang, thi hang, thu 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) OR (ty xang)))) 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) OR (ty xang)))) xa hoi. lieu va dau tuc van hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) or (((ty hang) OR (ty xang)))) xa hoi. lieu va dau tuc van hanh vi luu tre*".