Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, gian cac
so sanh » do sanh
sanh tu » anh tu, danh tu, hanh tu
vien da » vien dai, hien dai
tu manh » tu minh, tu hanh, vu manh
manh xa » manh xay, mang xa, manh ba
cua tre » cua te, cuu tre, cua triet
xac va » tac va, ac va, bac va
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: so sanh tu manh xa hoi. hieu ((vien cac) OR (vien da)) ((xac va) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh tu manh xa hoi. hieu ((vien cac) OR (vien da)) ((xac va) OR (tuc va)) hanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh tu manh xa hoi. hieu ((vien cac) OR (vien da)) ((xac va) or (tuc va)) hanh vi cua tre*".