Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
bac dai » bach mai
cua tre » cua te, cuu tre, cua triet
bac dao » tac dao, ba dao, bac cao
ty nang » ky nang, ty xang, ty hang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu van ((bac dao) OR (bac dai)) van ((thanh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu van ((bac dao) OR (bac dai)) van ((thanh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. hieu van ((bac dao) OR (bac dai)) van ((thanh vi) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu van ((bac dao) OR (bac dai)) van ((thanh vi) or (hanh vi)) cua tre*.