Perhaps you should try some spelling variations:
dang xay » dang van, van xay
vien cac » vien bach, vien dai, vien da
tan lanh » tai lanh, thanh lanh, tan thanh
lanh hai » manh hai, thanh hai, lang chai
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
ve cac » va cac
hai su » hai vu, lai su, hai so

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 dang xay hoi. hieu ((ve cac) or (vien cac)) duc tan lanh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ((ve cac) OR (vien cac)) duc tan lanh hai su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ((ve cac) or (vien cac)) duc tan lanh hai su triet*.