Perhaps you should try some spelling variations:
su triet » su tien, ve triet
tham hoc » thai hoc, tham hoa, than hoc
su sach » so sach, vu sach
va tham » van tham, va cham, va thanh
mai hoi » mai khoi, dai hoi, lai hoi
su viet » so viet
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
ma hoi » xa hoi, ma hoa, me hoi

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) OR (mai hoi)). lieu va tham hoc va dan vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((ma hoi) OR (mai hoi)). lieu va tham hoc va dan vi ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((ma hoi) OR (mai hoi)). lieu va tham hoc va dan vi ((su triet) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((ma hoi) OR (mai hoi)). lieu va tham hoc va dan vi ((su triet) or (su viet))*.