Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
van dinh » van minh, van dich, xuan dinh
su sach » so sach
tai cuu » tai cuc, tai buu, tai cua
va dinh » va kinh, va tinh, vu dinh
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, vu khach
y lang » o lang, _ lang, tay lang
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 (vu sach)) y lang xa hoi. hieu ve cac thuc ((va dinh) or (van dinh)) tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y lang xa hoi. hieu ve cac thuc ((va dinh) OR (van dinh)) tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y lang xa hoi. hieu ve cac thuc ((va dinh) or (van dinh)) tai cuu tre*".