Perhaps you should try some spelling variations:
thien van » thi van
cac thuc » cach thuc, cac thu, can thuc
sang mai » sang ma, sang tai, lang mai
sach ky » sac ky, sach y, sach ty
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
va dao » ca dao
cua tu » cua tuc, cua su, cua cu

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 ky sang mai hoi. ((thien van) or (hieu qua)) cac thuc ((va dau) OR (va dao)) lai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang mai hoi. ((thien van) OR (hieu qua)) cac thuc ((va dau) OR (va dao)) lai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang mai hoi. ((thien van) or (hieu qua)) cac thuc ((va dau) OR (va dao)) lai cua tu*".