Perhaps you should try some spelling variations:
van phan » van phong, van thanh, luan phan
phan tai » pham tai, nhan tai, phan thi
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau
duc van » duc va, duc tan, duc manh
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: su sach ky ((nang xa) or (lang xa)) hoi. hieu ((van cau) OR (van hau)) duc van phan tai cuc tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van cau) OR (van hau)) duc van phan tai cuc tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang xa)) hoi. hieu ((van cau) OR (van hau)) duc van phan tai cuc tu*".