Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
cuu tre » cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
ve cac » vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x hoi. hieu ((ve cac) OR (va cac)) suc manh hanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. hieu ((ve cac) OR (va cac)) suc manh hanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. hieu ((ve cac) OR (va cac)) suc manh hanh va ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. hieu ((ve cac) OR (va cac)) suc manh hanh va ((cua tre) or (cuu tre))*.