Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
van tuan » van quan, van ban, anh tuan
sach ky » sac ky, sach ty, sach kem
tuan du » toan du, xuan du, tuan cu
du ban » dua ban, duc ban, du bao
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ky) OR (sach y)) nang x hoi. hieu van tuan du ban hanh lai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) nang x hoi. hieu van tuan du ban hanh lai ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach y)) nang x hoi. hieu van tuan du ban hanh lai ((cua triet) or (va triet))*".