Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((nang xa) or (mang may)) hoi. hieu ve cam duc ((van hanh) OR (van thanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (mang may)) hoi. hieu ve cam duc ((van hanh) OR (van thanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((nang xa) or (mang may)) hoi. hieu ve cam duc ((van hanh) OR (van thanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (mang may)) hoi. hieu ve cam duc ((van hanh) OR (van thanh)) tai cua tre*.