Perhaps you should try some spelling variations:
phat hien » phat trien
hanh ngay » nhanh ngan, hanh nghe, thanh nga
hanh nam » thanh nam, hanh lam, hoang nam
cac duc » cac du, cao duc, cac dac
su sach » vu sach
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ha hoi » hoa hoi, ha noi, xa hoi
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) or (so sach)) ky lang ha hoi. hieu ve cac duc va ((hanh nam) OR (hanh ngay)) phat hien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky lang ha hoi. hieu ve cac duc va ((hanh nam) OR (hanh ngay)) phat hien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky lang ha hoi. hieu ve cac duc va ((hanh nam) OR (hanh ngay)) phat hien".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky lang ha hoi. hieu ve cac duc va ((hanh nam) OR (hanh ngay)) phat hien*.