Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
ve triet » su triet
hanh doi » thanh doi, hanh noi, hang doi
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
ban luc » van luc, bao luc, nang luc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
luc va » duc va, tuc va, loc va
su sac » su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (su sach)) ky tang xa hoi. hieu van ban luc va hanh doi ((ve triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su sach)) ky tang xa hoi. hieu van ban luc va hanh doi ((ve triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su sach)) ky tang xa hoi. hieu van ban luc va hanh doi ((ve triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky tang xa hoi. hieu van ban luc va hanh doi ((ve triet) OR (va trien))*.