Perhaps you should try some spelling variations:
khoa hoi » khoan hoi, khoa hoc, khoa doi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
hoa hoi » hoa hoc, hoa doi, hoc hoi
qua cam » qua cham, qua cac, qua ca
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang ((hoa hoi) OR (khoa hoi)). hieu qua cam xuc ((gia thanh) or (va hanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ((hoa hoi) OR (khoa hoi)). hieu qua cam xuc ((gia thanh) OR (va hanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((hoa hoi) OR (khoa hoi)). hieu qua cam xuc ((gia thanh) or (va hanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((hoa hoi) OR (khoa hoi)). hieu qua cam xuc ((gia thanh) or (va hanh)) vi cua tre*.