Perhaps you should try some spelling variations:
luyen tre » luyen tri, huyen tren, tuyen tren
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
cham luu » cham cuu, chat lua, phap luu
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
va cham » va chat, va tham
nang xa » nang x, lang xa, nang ma
luu van » cuu van, luan van, luu hanh
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 cham luu van thanh 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 cham luu van thanh 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 cham luu van thanh vi ((luy tre) OR (luyen tre))*".