Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, duc va
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 (thu sach)) ty xang xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ty xang xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ty xang xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ty xang xa hoi. hieu va cam ((tuc va) OR (tuc xa)) hanh vai cua te*.