Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
vien dai » hien dai
sach ky » sac ky, sach y, sach ty
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
ve cac » va cac, vien cac
ha hoi » hoa hoi, ha noi, xa hoi
lam su » lai su, lam so, lam vu

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 tang ha hoi. hieu ((ve cac) or (vien dai)) duc ((van hanh) or (va thanh)) lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ha hoi. hieu ((ve cac) OR (vien dai)) duc ((van hanh) OR (va thanh)) lam su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ha hoi. hieu ((ve cac) or (vien dai)) duc ((van hanh) or (va thanh)) lam su triet*.