Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cau treo » cau theo, cau tren, cau triet
thanh va » thanh van, hanh va, thanh ha
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
sang ma » tang ma, nang ma, sang tao
sach ky » sac ky, sach y, sach ty
soc gia » toc gia, hoc gia, so gia
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach

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 ky ((nang xa) or (sang ma)) hoi. hieu van cham soc gia thanh va ((cau treo) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (sang ma)) hoi. hieu van cham soc gia thanh va ((cau treo) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (sang ma)) hoi. hieu van cham soc gia thanh va ((cau treo) or (su triet))*.