Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh ca » thanh cha, thanh cac, thanh ha
duc gia » quoc gia
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
va cam » va cham, va cac, va cao
ca cua » co cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) y nang x ho. hieu ((ve cac) or (va cam)) duc gia thanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang x ho. hieu ((ve cac) OR (va cam)) duc gia thanh ca cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang x ho. hieu ((ve cac) or (va cam)) duc gia thanh ca cua te*".