Perhaps you should try some spelling variations:
thien van » thi van
nang cau » nang cao, hang cau, nang dau
van tham » van thanh, van tuan, van chat
tham tuc » tham thuc, thai tuc, nham thuc
hanh lai » hanh lam, hanh tai, thanh lap
su triet » su viet, su tien, ve triet
sach ty » sach thu, xach tay, sach hay
sach tu » sach thu, cach tu, sach uu
xa hanh » xa thanh, xa khanh, va hanh

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 ty) OR (sach tu))) or (sach y)) nang cau hoi. thien van tham tuc xa hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ty) OR (sach tu))) OR (sach y)) nang cau hoi. thien van tham tuc xa hanh lai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((((sach ty) OR (sach tu))) or (sach y)) nang cau hoi. thien van tham tuc xa hanh lai su triet*".