Perhaps you should try some spelling variations:
ngan thanh » nganh thanh, ngon thanh, nhan thanh
thanh tai » thanh hai, thanh toan, doanh tai
ky thanh » ky hanh, ty thanh, y thanh
su triet » su viet, su tien, ve triet
so viet » hoc viet
pho doi » pho voi, cho doi, phu doi
hieu ve » hieu va, hieu van
tu ngan » vu ngan, tu ngay, te ngan
tu sac » tu sach, tu san, tu bac
ve nam » he nam, va nam, le nam
nam tu » nam thu, nam thuc

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) or (tu cac)) ky thanh pho doi. hieu ve nam tu ngan thanh tai ((su triet) or (so viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) ky thanh pho doi. hieu ve nam tu ngan thanh tai ((su triet) OR (so viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu cac)) ky thanh pho doi. hieu ve nam tu ngan thanh tai ((su triet) or (so viet))*.