Perhaps you should try some spelling variations:
tham hoc » thai hoc, tham hoa, thao hoc
than hoc » toan hoc, thai hoc, than doc
su triet » su viet, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. lieu va ((tham hoc) OR (than hoc)) va danh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. lieu va ((tham hoc) OR (than hoc)) va danh vi ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. lieu va ((tham hoc) OR (than hoc)) va danh vi ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. lieu va ((tham hoc) OR (than hoc)) va danh vi ((su triet) or (su tien))*.