Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
tac tang » tac vang, tuc tang, tay tang
toc cac » hoc cac, tuc cac, ton cac
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac tac » cac toc, cac bac, cac dac
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cac ky lang xa hoi. hieu vien cac tac tang hanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cac ky lang xa hoi. hieu vien cac tac tang hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc cac ky lang xa hoi. hieu vien cac tac tang hanh vi ((cua tre) OR (cua te))*.