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