Perhaps you should try some spelling variations:
manh thanh » danh thanh, minh thanh, manh thang
thanh hai » thanh phan, thanh hoa, thanh san
duc manh » suc manh, duc anh, duc minh
cau tren » dau tren, ca tren, cau treo
tu sach » thu sach, su sach, te sach
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
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: tu sach y nang x hoi. ((hieu ve) OR (hieu va)) cao duc manh thanh hai ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. ((hieu ve) OR (hieu va)) cao duc manh thanh hai ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu ve) OR (hieu va)) cao duc manh thanh hai ((cau tren) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu ve) OR (hieu va)) cao duc manh thanh hai ((cau tren) or (cu tren))*.