Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
chat doc » chat hoc, chau doc, thuat doc
nang cau » nang cao, hang cau, nang dau
thien va » thien van, tien va, thien tai
chat soc » cham soc, chat hoc, chat song
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty

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