Perhaps you should try some spelling variations:
nang ra » nang ma, lang ra, nang ro
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
cua su » qua 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 ((sac ky) or (sach y)) ((nang cao) or (nang ra)) hoi. hieu qua cam tuc va hanh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach y)) ((nang cao) OR (nang ra)) hoi. hieu qua cam tuc va hanh vi cua su.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach y)) ((nang cao) or (nang ra)) hoi. hieu qua cam tuc va hanh vi cua su*.