Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
pham duy » pham duc
phan duc » pham duc, phan tu, phan dau
cua viet » ca viet, hoa viet, cua vat
lang ha » long ha
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
lai cua » dai cua, hai cua, lai chau
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: thu ((sach tu) OR (sach ty)) lang ha hoi. hieu ve ((phan duc) or (pham duy)) van hanh lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tu) OR (sach ty)) lang ha hoi. hieu ve ((phan duc) OR (pham duy)) van hanh lai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach tu) OR (sach ty)) lang ha hoi. hieu ve ((phan duc) or (pham duy)) van hanh lai cua viet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach tu) OR (sach ty)) lang ha hoi. hieu ve ((phan duc) or (pham duy)) van hanh lai cua viet*.