Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh hai » thanh hai, nhanh hai, hang hai
thuc toc » thac toc, thuc uoc, thuc thuc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu va » lieu va
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
toc va » hoc va, toc ta, tuc va
hai su » hai vu, lai su, hai so

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 ((tu nang) OR (tu nong)) xa hoi. ((hieu va) or (hieu qua)) thuc toc va hanh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tu nong)) xa hoi. ((hieu va) OR (hieu qua)) thuc toc va hanh hai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nang) OR (tu nong)) xa hoi. ((hieu va) or (hieu qua)) thuc toc va hanh hai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((tu nang) OR (tu nong)) xa hoi. ((hieu va) or (hieu qua)) thuc toc va hanh hai su triet*.