Perhaps you should try some spelling variations:
tu trung » tu trong, su trung, tru truong
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
tu truc » tu thuoc
nang xa » nang x, lang xa, nang ma

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