Perhaps you should try some spelling variations:
vien hoc » vien khoa, khien hoc, van hoc
dien hoc » dien hoa, khien hoc, tin hoc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
va tinh » may tinh
vai cua » dai cua, hai cua, lai cua
vi cua » di cua
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang x ho. hieu ((vien hoc) OR (dien hoc)) nuoc va tinh ((vi cua) or (vai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x ho. hieu ((vien hoc) OR (dien hoc)) nuoc va tinh ((vi cua) OR (vai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x ho. hieu ((vien hoc) OR (dien hoc)) nuoc va tinh ((vi cua) or (vai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x ho. hieu ((vien hoc) OR (dien hoc)) nuoc va tinh ((vi cua) or (vai cua)) triet*.