Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
thu sach » thuat sach, thuoc sach, thu hoach
va tang » va trang, van tang, ha tang
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
tu sach » su sach, te sach, tu cach
xa tinh » va tinh, ha tinh, ca tinh
tinh di » tinh doi, trinh di, tinh da
ma hoi » mai hoi, xa hoi, ma hoa
di cau » da cau, diem cau

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) OR (tu sach)) va tang ma hoi. hieu ve ((cham tuc) or (tham thuc)) xa tinh di cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) va tang ma hoi. hieu ve ((cham tuc) OR (tham thuc)) xa tinh di cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) va tang ma hoi. hieu ve ((cham tuc) or (tham thuc)) xa tinh di cau triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) va tang ma hoi. hieu ve ((cham tuc) or (tham thuc)) xa tinh di cau triet*.