Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ve
thanh ha » thanh hoa, thanh hai, nhanh ha
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van bao » van ban, van dao
duc van » duc va, duc manh, duc phan
cuu tre » cua tre, cau tren, cau treo
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 ky nang x hoi. hieu van bao ((duc van) or (duc tan)) ((thanh va) OR (thanh ha)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu van bao ((duc van) OR (duc tan)) ((thanh va) OR (thanh ha)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu van bao ((duc van) or (duc tan)) ((thanh va) OR (thanh ha)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu van bao ((duc van) or (duc tan)) ((thanh va) OR (thanh ha)) cuu tre*.