Perhaps you should try some spelling variations:
tham luan » pham luan, thai luan, ham luan
luyen tre » luyen tri, huyen tren, tuyen tren
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
te cac » tu cac, ve cac, te cao

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 (tang ma)) hoi. hieu va tham luan van hanh vi ((luy tre) OR (luyen tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((nang xa) OR (tang ma)) hoi. hieu va tham luan van hanh vi ((luy tre) OR (luyen tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((nang xa) or (tang ma)) hoi. hieu va tham luan van hanh vi ((luy tre) OR (luyen tre))".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang xa) or (tang ma)) hoi. hieu va tham luan van hanh vi ((luy tre) OR (luyen tre))*.