Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
hanh oi » hanh noi, hanh moi, hanh voi
xuc van » duc van, luc van, vuc van
su sach » vu sach
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
oi su » ki su, vi 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) or (so sach)) ky nang ma hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh oi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang ma hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh oi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang ma hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh oi su triet*".