Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thu sach » thuat sach, thuoc sach, thu hoach
su triet » su viet, su tien, ve triet
nang hoa » nang hoat, hang hoa, nang hoc
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
cac ban » cac van, can ban, cac bai
tu sach » su sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
van su » dan su
va dao » ca dao

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)) y nang hoa hoi. hieu va dao ((cac ban) or (cac dan)) thanh van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang hoa hoi. hieu va dao ((cac ban) OR (cac dan)) thanh van su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) y nang hoa hoi. hieu va dao ((cac ban) or (cac dan)) thanh van su triet*".