Perhaps you should try some spelling variations:
va triet » va trien, ve triet, cua triet
van hanh » van thanh, ban hanh, van anh
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
va hanh » va thanh, va danh, ban hanh
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
van xa » van xay, van ha, dan xa
ly van » le van, ly va, ly von
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: su sach ly van xa hoi. hieu ve nam thuc ((va hanh) OR (van hanh)) vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly van xa hoi. hieu ve nam thuc ((va hanh) OR (van hanh)) vai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly van xa hoi. hieu ve nam thuc ((va hanh) OR (van hanh)) vai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach ly van xa hoi. hieu ve nam thuc ((va hanh) OR (van hanh)) vai ((va triet) or (va thiet))*.