Perhaps you should try some spelling variations:
thieu nien » thien nhien
cao khoa » lao khoa, bao khoa, cac khoa
nien cac » vien cac, dien cac, bien cac
gian cua » gian xu, ban cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cac hoc » cach hoc, cac hop, bac hoc
va nang » van nang, da nang, cam nang
via cua » gia cua, giau cua, rija cua
ca cua » co 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 ky nang cao khoa. thieu nien cac hoc va nang ((((via cua) OR (gian cua))) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao khoa. thieu nien cac hoc va nang ((((via cua) OR (gian cua))) OR (ca cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang cao khoa. thieu nien cac hoc va nang ((((via cua) OR (gian cua))) or (ca cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao khoa. thieu nien cac hoc va nang ((((via cua) OR (gian cua))) or (ca cua)) tre*.