Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
vien dai » hien dai
vinh cua » sinh cua, tinh cua, dinh cua
van hanh » ban hanh, van anh, van ban
te sach » toc sach
sach ky » sac ky, sach y, sach ty
vien da » hien dai
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu ((vien da) OR (vien dai)) xuc ((van thanh) or (van hanh)) vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ((vien da) OR (vien dai)) xuc ((van thanh) OR (van hanh)) vinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu ((vien da) OR (vien dai)) xuc ((van thanh) or (van hanh)) vinh cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ma hoi. hieu ((vien da) OR (vien dai)) xuc ((van thanh) or (van hanh)) vinh cua tre*.