Perhaps you should try some spelling variations:
tinh vien » sinh vien, tinh dien, tinh viet
cua viet » ca viet, hoa viet, cua vat
vien cua » viec cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
tuc va » thuc va, truc va, tuc xa
loc va » hoc va, luc va
ma hoi » mai 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: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam ((tuc va) or (loc va)) tinh vien cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam ((tuc va) OR (loc va)) tinh vien cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam ((tuc va) or (loc va)) tinh vien cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam ((tuc va) or (loc va)) tinh vien cua viet*.