Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
kien su » nien su, tien su, vien sau
duc van » duc va, duc tan, duc manh
sach vu » sach va, sach tu, sach xu
nang ma » tang ma, sang ma, nang cao
sach uu » sach luu, sach tu, sach xu
ma hoi » mai hoi, xa hoi, ma hoa
va cao » va co, va dao, va bao

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 vu) or (sach uu)) nang ma hoi. hieu ((va cao) OR (va cac)) duc van hanh kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach vu) OR (sach uu)) nang ma hoi. hieu ((va cao) OR (va cac)) duc van hanh kien su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach vu) or (sach uu)) nang ma hoi. hieu ((va cao) OR (va cac)) duc van hanh kien su triet".
• Adding a wildcard symbol may retrieve word variants: vu ((sach vu) or (sach uu)) nang ma hoi. hieu ((va cao) OR (va cac)) duc van hanh kien su triet*.