Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
lanh hai » manh hai, thanh hai, lang chai
dang xay » dang van, van xay
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
hai su » hai vu, lai su, hai so
ve cac » va cac, vien cac

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) or (sach y)) dang xay hoi. hieu ve cac ((duc ban) OR (duc van)) lanh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) dang xay hoi. hieu ve cac ((duc ban) OR (duc van)) lanh hai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach y)) dang xay hoi. hieu ve cac ((duc ban) OR (duc van)) lanh hai su triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach y)) dang xay hoi. hieu ve cac ((duc ban) OR (duc van)) lanh hai su triet*.