Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
de triet » ve triet, de thiet, su triet
cham duc » pham duc, cham soc, pham duy
phan de » phan le, phan ve, phan do
duc gia » quoc gia
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
sang ma » tang ma, nang ma, sang tao
nang xa » lang xa, nang ma, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((((nang xa) or (nang x))) or (sang ma)) hoi. hieu vu cham duc gia thanh phan de triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((((nang xa) OR (nang x))) OR (sang ma)) hoi. hieu vu cham duc gia thanh phan de triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((((nang xa) or (nang x))) or (sang ma)) hoi. hieu vu cham duc gia thanh phan de triet*.