Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
va hanh » va thanh, va danh, ban hanh
vu sach » vu bach, su sach, vu khach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve cai » va cai, ve tai, ve cau
ve cac » va cac, vien cac
vi su » va su, ve su, ki su

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 ky dang xay hoi. hieu ((ve cai) or (ve cac)) duc ((va hanh) OR (van hanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky dang xay hoi. hieu ((ve cai) OR (ve cac)) duc ((va hanh) OR (van hanh)) vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky dang xay hoi. hieu ((ve cai) or (ve cac)) duc ((va hanh) OR (van hanh)) vi su triet*".