Perhaps you should try some spelling variations:
chat thien » phat trien, cai thien, chat dien
phat hien » phat trien
hanh cad » hanh cac, hanh cat, hanh cap
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
sach ky » sac ky, sach y, sach kem
lang ha » long ha
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
ha hoi » hoa hoi, ha noi, xa hoi

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 ty)) lang ha hoi. hieu ve cac duc va hanh cad ((chat thien) OR (phat hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) lang ha hoi. hieu ve cac duc va hanh cad ((chat thien) OR (phat hien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach ty)) lang ha hoi. hieu ve cac duc va hanh cad ((chat thien) OR (phat hien))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) lang ha hoi. hieu ve cac duc va hanh cad ((chat thien) OR (phat hien))*.