Perhaps you should try some spelling variations:
thieu nien » thien nhien
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, hieu tieng
cay thuc » cay thuoc, can thuc, day thuc
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua

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) OR (v nang)) xa hoi. ((hieu vien) OR (thieu nien)) cay thuc va hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) xa hoi. ((hieu vien) OR (thieu nien)) cay thuc va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) xa hoi. ((hieu vien) OR (thieu nien)) cay thuc va hanh vi cua triet*.