Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
tuc van » thuc van, truc van, tuc va
su sach » so sach, vu sach
ty nang » ky nang, ty hang, ly nang
dau tuc » dau tu, dao tuc, cau truc
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 (ty xang)) xa hoi. lieu va dau tuc van ((hanh di) or (hanh de)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty xang)) xa hoi. lieu va dau tuc van ((hanh di) OR (hanh de)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ty xang)) xa hoi. lieu va dau tuc van ((hanh di) or (hanh de)) cua triet*".