Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
tham duc » pham duc, tham du, than duc
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((lang xa) or (tang van)) hoi. hieu va tham duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((lang xa) OR (tang van)) hoi. hieu va tham duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((lang xa) or (tang van)) hoi. hieu va tham duc va hanh vi cua tre*.