Perhaps you should try some spelling variations:
hanh cua » manh cua, hang cua, hanh sua
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
ky sang » ky nang, ky dang, duy sang
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
cua su » qua su

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