Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
anh kien » danh kien, hanh kien, anh kiem
kien su » nien su, tien su, vien sau
vuc van » luc van, thuc van, chuc van
duc van » duc va, duc tan, duc manh
su sach » so sach, vu sach
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
va nang » van nang, da nang, cam nang
ma hoi » mai hoi, xa hoi, me hoi
va cam » va cham, va cac, va cao

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