Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
hanh sai » hanh san, hanh tai, danh sai
ve triet » va trien, su triet
ky tang » ky dang, kho tang, ky trong
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
xuc va » duc va, tuc va, luc va
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: toc sach ((ky tang) OR (ky nang)) xa hoi. thien van nam xuc va hanh sai ((ve triet) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky tang) OR (ky nang)) xa hoi. thien van nam xuc va hanh sai ((ve triet) OR (cua tu))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky tang) OR (ky nang)) xa hoi. thien van nam xuc va hanh sai ((ve triet) or (cua tu))*".