Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nuoc van » nuoc va, nuoc san, luoc van
hieu van » hieu va, thien van, lieu va
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
van cac » van hac, van cau, van bac
van anh » van thanh, tuan anh, van minh
anh lai » anh bai, anh tai, gianh lai
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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 van anh lai ((cua tre) OR (cuu 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 van anh lai ((cua tre) OR (cuu 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 van anh lai ((cua tre) OR (cuu tre))*".