Perhaps you should try some spelling variations:
thien van » thi van
thanh lap » thanh san, phan lap, thanh hai
nang cau » nang cao, hang cau, nang dau
van cham » van chat, van tham, va cham
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
doc va » duoc va, duc va, loc va
lap su » lap du, lap tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang cau hoi. thien van cham ((doc va) or (hoc va)) thanh lap su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoi. thien van cham ((doc va) OR (hoc va)) thanh lap su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. thien van cham ((doc va) or (hoc va)) thanh lap su triet*.