Perhaps you should try some spelling variations:
van thai » van thoai, van tai, van thi
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
van hai » van ha, van chat, van hanh
nang xa » nang x, lang xa, nang ma
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu ((van thai) or (van hai)) thuc va danh vi ((cua tre) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((van thai) OR (van hai)) thuc va danh vi ((cua tre) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((van thai) or (van hai)) thuc va danh vi ((cua tre) or (su viet))*.