Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
cac nuoc » cap nuoc, dat nuoc, cua nuoc
hieu van » hieu va, thien van, lieu va
lai cua » dai cua, hai cua, lai chau
anh lai » anh bai, anh tai, gianh lai
van anh » van thanh, tuan anh, van minh
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (su sach)) ky nang xa hoi. hieu van ((cac nuoc) OR (hoc nuoc)) van anh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (su sach)) ky nang xa hoi. hieu van ((cac nuoc) OR (hoc nuoc)) van anh lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu khach) or (su sach)) ky nang xa hoi. hieu van ((cac nuoc) OR (hoc nuoc)) van anh lai cua tre*".