Perhaps you should try some spelling variations:
chat triet » chet triet, phat trien, chat thien
thanh lap » thanh san, phan lap, thanh hai
thanh lam » hanh lam, thanh nam, thanh tam
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ve cac » va cac, vien cac
du va » dau va, tu va, su va

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 ty) or (sach thu)) tang xa hoi. hieu ve cac du va ((thanh lam) OR (thanh lap)) chat triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) tang xa hoi. hieu ve cac du va ((thanh lam) OR (thanh lap)) chat triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach thu)) tang xa hoi. hieu ve cac du va ((thanh lam) OR (thanh lap)) chat triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thu)) tang xa hoi. hieu ve cac du va ((thanh lam) OR (thanh lap)) chat triet*.