Perhaps you should try some spelling variations:
phan tai » pham tai, nhan tai, phan thi
van phan » van phong, van thanh, luan phan
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
lang xa » lang ha, dang xay, lang van
sach ky » sach y, sach ty, sach kem
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky
cuc tu » cuc du, luc tu, duc tu

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) OR (sac ky)) ((nang xa) or (lang xa)) hoi. hieu van cau duc van phan tai cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((nang xa) OR (lang xa)) hoi. hieu van cau duc van phan tai cuc tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) ((nang xa) or (lang xa)) hoi. hieu van cau duc van phan tai cuc tu".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) ((nang xa) or (lang xa)) hoi. hieu van cau duc van phan tai cuc tu*.