Perhaps you should try some spelling variations:
sinh thi » sinh thai, dinh thi, ninh thi
va triet » va trien, ve triet, cua triet
thi hanh » thi thanh
hanh vai » hanh vi, hanh va, hanh tai
hanh ca » hanh cac, hanh cat, hanh cua
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
xa hanh » xa thanh, xa khanh, va hanh
ca hoi » cau hoi, cua hoi, xa hoi
thiet » thieu

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

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