Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
hanh vai » hanh vi, hanh tai, hanh van
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
cam duc » cam xuc, cao duc, pham duc
te sach » toc sach
hieu ve » hieu va
hang xa » hoang xa, hang va, hang ca

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thi hang xa hoi. ((hieu ve) OR (hieu van)) cam duc va ((hanh vai) OR (hanh va)) dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thi hang xa hoi. ((hieu ve) or (hieu van)) cam duc va ((hanh vai) OR (hanh va)) dau tren~".
• Adding a wildcard symbol may retrieve word variants: te sach thi hang xa hoi. ((hieu ve) or (hieu van)) cam duc va ((hanh vai) OR (hanh va)) dau tren*.