Perhaps you should try some spelling variations:
thieu hanh » thien thanh, thien chanh, thieu khang
thanh vai » thanh hai, thanh van, thanh tai
toc sach » hoc sach, doc sach, thuoc sach
xa thanh » va thanh, ha thanh, ta thanh
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
cac tuc » cac tu, cac tac, cac nuoc
ca hoi » cau hoi, cua hoi, co hoi
vai va » mai va, dai va, hai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thieu hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) or (cac toc)) xa thanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thieu hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) OR (cac toc)) xa thanh vai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thieu hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) or (cac toc)) xa thanh vai va triet".
• Adding a wildcard symbol may retrieve word variants: toc sach thieu hanh ((ca hoi) OR (xa hoi)). hieu va ((cac tuc) or (cac toc)) xa thanh vai va triet*.