Perhaps you should try some spelling variations:
thanh cau » thanh chau, thanh mau, nhanh cau
van thanh » ban thanh, van tuan
van nhanh » van hanh, van khanh, van nhan
cau tren » cu tren, dau tren, ca tren
cac xuc » cam xuc, cac nuoc, chat xuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
o lai » o lao
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((o hoi) or (o lai)). hieu ve cac xuc ((van nhanh) or (van thanh)) thanh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hoi) OR (o lai)). hieu ve cac xuc ((van nhanh) OR (van thanh)) thanh cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) or (o lai)). hieu ve cac xuc ((van nhanh) or (van thanh)) thanh cau tren*.