Perhaps you should try some spelling variations:
tham hoa » pham hoa, thanh hoa, pham khoa
su triet » su viet, ve triet
lieu van » lieu va, hieu van, sieu van
tham hoc » thai hoc, than hoc, thao hoc
su sach » so sach, vu sach
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
su tien » su kien, su hien, tu tieng
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. lieu van ((tham hoc) OR (tham hoa)) 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 ma hoi. lieu van ((tham hoc) OR (tham hoa)) 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 ma hoi. lieu van ((tham hoc) OR (tham hoa)) va danh vi ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. lieu van ((tham hoc) OR (tham hoa)) va danh vi ((su triet) or (su tien))*.