Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
van nhanh » van thanh, van hanh, van nhan
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach ty, sach kem
tang ho » tang cho, tung ho, tang ha
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
ho hai » hoc hai, pho hai, cho hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach y)) tang ho hai. hieu ve cac xuc ((van nhanh) or (van khanh)) tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) tang ho hai. hieu ve cac xuc ((van nhanh) OR (van khanh)) tri cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) tang ho hai. hieu ve cac xuc ((van nhanh) or (van khanh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) tang ho hai. hieu ve cac xuc ((van nhanh) or (van khanh)) tri cua tre*.