Perhaps you should try some spelling variations:
thanh mai » thanh hai, thanh tai, thanh moi
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
tu triet » su triet, tu thiet, tu trien
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac tu » cac thu, cach tu, cac du
tu ban » thu ban, te ban
mai tu » tai tu

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 y ((nang xa) or (dang xay)) hoi. hieu va cac tu ban thanh mai tu triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (dang xay)) hoi. hieu va cac tu ban thanh mai tu triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (dang xay)) hoi. hieu va cac tu ban thanh mai tu triet*.