Perhaps you should try some spelling variations:
thien van » thi van
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
van chat » cao chat
chat luc » chat xuc, chat lua, nhan luc
va danh » va dinh, va dan, dia danh
tu sach » thu sach, su sach, te sach
va hanh » va thanh, ban hanh, dao hanh
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
di va » dai va, di vao, doi va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky dang xay hoi. thien van chat luc ((((va hanh) OR (va danh))) or (van hanh)) di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. thien van chat luc ((((va hanh) OR (va danh))) OR (van hanh)) di va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. thien van chat luc ((((va hanh) OR (va danh))) or (van hanh)) di va triet*".