Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
doi cua » dai cua, hoi cua, dong cua
cua tre » cua te, cuu tre, cua triet
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 (ky nang)) xa hoi. lieu va dau tuc van hanh doi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ky nang)) xa hoi. lieu va dau tuc van hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ky nang)) xa hoi. lieu va dau tuc van hanh doi cua tre*.