Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
van hanh » van thanh, ban hanh, van anh
nang hoi » nang noi, nang hoc, nang ho
tu cach » tu cac
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, vuc van
vu chat » va chat, ve chat, du chat
hieu vu » hieu va, hieu ve, hieu su
hoi hoc » hoa hoc, khoa hoc, hoi chuc
so sach » so sanh, bo sach, co sach
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (so sach)) ky nang hoi hoc. hieu vu chat xuc van hanh ((di cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky nang hoi hoc. hieu vu chat xuc van hanh ((di cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky nang hoi hoc. hieu vu chat xuc van hanh ((di cua) or (vai cua)) tre*.