Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh cua » manh cua, hang cua, hanh sua
van hanh » van thanh, ban hanh, van anh
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang xa) or (nang ma)) hoi. hieu ve cac luc van hanh cua ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (nang ma)) hoi. hieu ve cac luc van hanh cua ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang ma)) hoi. hieu ve cac luc van hanh cua ((cua triet) or (va triet))*.