Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
va sac » va cac, va suc, va san
sac ky » cac ky, sai ky
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: va sac ky nang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((va danh) or (va thanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: va sac ky nang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((va danh) OR (va thanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "va sac ky nang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((va danh) or (va thanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: va sac ky nang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((va danh) or (va thanh)) di cua tre*.