Perhaps you should try some spelling variations:
van nhanh » van thanh, van hanh, van khanh
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
thai co » thai cao, thai o, tai co
thai do » thay doi, thai den
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((x hoi) OR (x ho)). hieu van cam tuc van nhanh ((thai co) or (thai do)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ((x hoi) OR (x ho)). hieu van cam tuc van nhanh ((thai co) OR (thai do)) viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((x hoi) OR (x ho)). hieu van cam tuc van nhanh ((thai co) or (thai do)) viet*".