Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
chat soc » cham soc, chat hoc, chat doc
van chat » cao chat
nang cau » nang cao, hang cau, nang dau
sach ky » sac ky, sach ty, sach kem
va hanh » van hanh, va danh, ban hanh

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) OR (sach y)) nang cau hoi. thien van chat soc ((va hanh) or (va thanh)) lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang cau hoi. thien van chat soc ((va hanh) OR (va thanh)) lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach y)) nang cau hoi. thien van chat soc ((va hanh) or (va thanh)) lai su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach y)) nang cau hoi. thien van chat soc ((va hanh) or (va thanh)) lai su triet*.