Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
va triet » va trien, ve triet, cua triet
sinh ky » sinh ly, sinh y, kinh ky
cao hoc » co hoc, cho hoc, chat hoc
nam tuc » nam thuc, nam truc, nam tu
va nam » van nam, ha nam, va nay
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 ky nang cao hoc. lieu va nam tuc ((va thanh) or (ban thanh)) di ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh ky nang cao hoc. lieu va nam tuc ((va thanh) OR (ban thanh)) di ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: hoc sinh ky nang cao hoc. lieu va nam tuc ((va thanh) or (ban thanh)) di ((va triet) or (va thiet))*.