Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
hanh vai » hanh vi, hanh va, hanh tai
sang ky » sang kyo, dang ky, tang ky
lao luc » bao luc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
san ky » van ky, dan ky, ban ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) or (sang ky)) nang x ho. ((hieu van) OR (thien van)) lao luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (sang ky)) nang x ho. ((hieu van) OR (thien van)) lao luc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) or (sang ky)) nang x ho. ((hieu van) OR (thien van)) lao luc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (sang ky)) nang x ho. ((hieu van) OR (thien van)) lao luc va hanh vai cua tre*.