Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
gia hanh » gia thanh, giao hanh, gia anh
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
duc gia » quoc gia
tu sac » tu sach, tu cac, tu san
ve cac » va cac, vien cac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang ma)) hoi. hieu ve cac duc gia hanh vi ((cau triet) or (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cac duc gia hanh vi ((cau triet) OR (cau thi)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (nang ma)) hoi. hieu ve cac duc gia hanh vi ((cau triet) or (cau thi))*.