Perhaps you should try some spelling variations:
tham luan » pham luan, thai luan, ham luan
van hanh » van thanh, ban hanh, van anh
tang ma » mang may, tang van
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
lua tre » cua tre, luy tre, dua tren
te cac » tu cac, ve cac, te cao
vi lua » vi luu

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

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