Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hang » thi hanh, thi nang, thi hong
cau tren » dau tren, ca tren, cau treo
hanh vai » hanh vi, hanh va, hanh tai
tan hanh » tan thanh, tang hanh, toan hanh
hieu van » thien van, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
cu tren » tu tren, dua tren

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: tu sach thi hang xa hoi. ((hieu va) OR (hieu van)) cam duc tan hanh vai ((cau tren) OR (cu tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hang xa hoi. ((hieu va) or (hieu van)) cam duc tan hanh vai ((cau tren) OR (cu tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hang xa hoi. ((hieu va) or (hieu van)) cam duc tan hanh vai ((cau tren) OR (cu tren))*.