Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach y, sach thu, xach tay
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach uu
ve cham » va cham, ve chat, vu cham
lai va » loai va, mai va, dai va
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: tu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cham ((duc ban) or (duc van)) hanh lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cham ((duc ban) OR (duc van)) hanh lai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cham ((duc ban) or (duc van)) hanh lai va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cham ((duc ban) or (duc van)) hanh lai va triet*.