Perhaps you should try some spelling variations:
vien cac » vien dai, vien da, gian cac
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac
loc va » hoc 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: tu sac ky nang ma hoi. hieu ((ve cac) or (((vien cac) OR (vien bach)))) loc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu ((ve cac) OR (((vien cac) OR (vien bach)))) loc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. hieu ((ve cac) or (((vien cac) OR (vien bach)))) loc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu ((ve cac) or (((vien cac) OR (vien bach)))) loc va hanh vi cua tre*.