Perhaps you should try some spelling variations:
qua than » qua thanh, qua phan, qua tan
than soc » than doc, than hoc, than so
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
ha hoi » hoa hoi, ha noi, xa hoi
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: te cac ky lang ha hoi. hieu qua than soc ((va hanh) OR (va thanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky lang ha hoi. hieu qua than soc ((va hanh) OR (va thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky lang ha hoi. hieu qua than soc ((va hanh) OR (va thanh)) vi cua tre*.