Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cau treo » cau theo, cau triet, cau trieu
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
bo sach » co sach, hoc sach
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (bo sach)) ty hang xa hoi. hieu ve cam tuc van hanh vai ((cau treo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (bo sach)) ty hang xa hoi. hieu ve cam tuc van hanh vai ((cau treo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (bo sach)) ty hang xa hoi. hieu ve cam tuc van hanh vai ((cau treo) or (cau tren))*.