Perhaps you should try some spelling variations:
nang doc » nang luc
xa khanh » xa thanh, van khanh, dat khanh
khanh vi » hanh vi, khanh v, nhanh vi
thu sac » thu sach, thu san, thu xac
nang ra » nang ma, lang ra, nang ro
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky ((((nang noi) or (nang doc))) or (nang ra)) hoi. hieu qua cac tuc xa khanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((((nang noi) OR (nang doc))) OR (nang ra)) hoi. hieu qua cac tuc xa khanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((((nang noi) or (nang doc))) or (nang ra)) hoi. hieu qua cac tuc xa khanh vi cua tu*.