Perhaps you should try some spelling variations:
may nang » may nong, ky nang, cao nang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
su sach » so sach, vu sach
qua cac » cua cac
va hang » van hang, va nang, va lang
hang vi » hang va, hanh vi, hang di
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((((may nang) or (cam nang))) or (v nang)) x hoi. hieu qua cac nuoc va hang vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((may nang) OR (cam nang))) OR (v nang)) x hoi. hieu qua cac nuoc va hang vi cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach ((((may nang) or (cam nang))) or (v nang)) x hoi. hieu qua cac nuoc va hang vi cua vat*.