Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
nang mai » nang ma, lang mai, nang cai
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
lam duc » lam duoc, pham duc, nam duoc
van lam » van nam
cua tre » cua te, cuu tre, cua triet
sang ky » sang kyo, dang ky, tang ky
vi cua » vai cua, di cua
san ky » van ky, dan ky, ban ky
phi » phai

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

• Performing a fuzzy search may retrieve terms with similar spellings: phi ((san ky) or (sang ky)) ((nang mai) OR (nang tai)) khoi. hieu van lam duc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: phi ((san ky) OR (sang ky)) ((nang mai) OR (nang tai)) khoi. hieu van lam duc va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "phi ((san ky) or (sang ky)) ((nang mai) OR (nang tai)) khoi. hieu van lam duc va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: phi ((san ky) or (sang ky)) ((nang mai) OR (nang tai)) khoi. hieu van lam duc va thanh vi cua tre*.