Perhaps you should try some spelling variations:
nang noi » nang doc
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
qua cac » cua cac
nang ra » nang ma, lang ra, nang ro
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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

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