Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
toc tang » tuc tang, hoc tang, toc mang
toc sac » toc sach, toc san, hoc sach
ky lang » ky dang, ky tang, tay lang
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ((ky lang) or (ky nang)) xa hoi. hieu hien cac toc tang hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ((ky lang) OR (ky nang)) xa hoi. hieu hien cac toc tang hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ((ky lang) or (ky nang)) xa hoi. hieu hien cac toc tang hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: toc sac ((ky lang) or (ky nang)) xa hoi. hieu hien cac toc tang hanh vi ((cua tre) OR (cuu tre))*.