Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((lang xa) or (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((lang xa) OR (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((lang xa) or (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((lang xa) or (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vi cua tre*.