Perhaps you should try some spelling variations:
nang ma » tang ma, sang ma, nang cao
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
tuc va » thuc va, tuc xa, duc 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 cac ky nang ma hoi. hieu ((ve cam) OR (ve cac)) ((tuc va) or (truc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ma hoi. hieu ((ve cam) OR (ve cac)) ((tuc va) OR (truc va)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ma hoi. hieu ((ve cam) OR (ve cac)) ((tuc va) or (truc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ma hoi. hieu ((ve cam) OR (ve cac)) ((tuc va) or (truc va)) hanh vi cua tre*.