Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
qua tham » qua cham, qua than, qua thanh
tham hoc » thai hoc, tham hoa, than hoc
cua tre » cua te, dua tren, cua thep
cuu tre » cau tren, cau treo
ky tang » ky nang, ky dang, kho tang
hoc ban » hoc bang, hoc dan, hoc bai
tang ha » lang ha, tang ma, trung ha
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve cac ky tang ha hoi. hieu qua tham hoc ban thanh vi ((((cua tre) OR (cua triet))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve cac ky tang ha hoi. hieu qua tham hoc ban thanh vi ((((cua tre) OR (cua triet))) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ve cac ky tang ha hoi. hieu qua tham hoc ban thanh vi ((((cua tre) OR (cua triet))) or (cuu tre))*".