Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
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: tu ((sach y) or (sac ky)) ((mang xa) or (nang x)) hoi. hieu va cam tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) ((mang xa) OR (nang x)) hoi. hieu va cam tuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) ((mang xa) or (nang x)) hoi. hieu va cam tuc va hanh vi cua tre*.