Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, su sach, vu khach
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
tu ang » tu lang, tu anc, tu anh
ang xa » lang xa, mang xa, dang xay
va cam » va cham, va cac, va cao

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 tu ang xa hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach tu ang xa hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach tu ang xa hoi. hieu va cam luc ((va hanh) OR (van hanh)) tri cua tre*.