Perhaps you should try some spelling variations:
may nang » may nong, ky nang, cao nang
hieu cua » hieu qua, dieu cua, bieu cua
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
cac xuc » cam xuc, cac nuoc, chat xuc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
xuc va » duc va, tuc va, luc va
di cua » dai cua, doi cua, de 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 (vu nang)) x hoi. hieu cua cac xuc va hang di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((((may nang) OR (cam nang))) OR (vu nang)) x hoi. hieu cua cac xuc va hang di cua vat.
• Adding a wildcard symbol may retrieve word variants: su sach ((((may nang) or (cam nang))) or (vu nang)) x hoi. hieu cua cac xuc va hang di cua vat*.