Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
cac lop » cac hop, cac loai
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
cac loc » cac toc, cac hoc, cac nuoc
te sac » te sach, te cac, te san
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang xa) or (lang van)) hoi. hieu ve ((cac loc) OR (cac lop)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (lang van)) hoi. hieu ve ((cac loc) OR (cac lop)) va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (lang van)) hoi. hieu ve ((cac loc) OR (cac lop)) va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (lang van)) hoi. hieu ve ((cac loc) OR (cac lop)) va hanh vi cua te*.