Perhaps you should try some spelling variations:
vat trinh » va trinh, van trinh, viet trinh
trinh van » trinh han, trinh quan, trinh toan
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
ve cau » ke cau, va cau, ve cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky lang xa hoi. hieu ve cau thuc vat trinh van ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang xa hoi. hieu ve cau thuc vat trinh van ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. hieu ve cau thuc vat trinh van ((cua tre) or (cua triet))*.