Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh di » thanh doi, thanh de, thanh do
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
bac hoc » bai hoc, bac ho
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va bac » van bac, va cac, va bai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu van) OR (tu va)) ky nang xa hoi. hieu va bac hoc va thanh di ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu van) OR (tu va)) ky nang xa hoi. hieu va bac hoc va thanh di ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((tu van) OR (tu va)) ky nang xa hoi. hieu va bac hoc va thanh di ((cua tre) or (cuu tre))*.