Perhaps you should try some spelling variations:
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
sach ky » sac ky, sach y, sach kem
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
cao hoc » co hoc, cho hoc, chat hoc
sach ty » sach y, sach tu, sach thu
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) OR (sach ty)) nang cao hoc. hieu ve cam xuc va ((hanh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach ty)) nang cao hoc. hieu ve cam xuc va ((hanh di) OR (hanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach ty)) nang cao hoc. hieu ve cam xuc va ((hanh di) or (hanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sach ty)) nang cao hoc. hieu ve cam xuc va ((hanh di) or (hanh de)) cua tre*.