Perhaps you should try some spelling variations:
van tren » van tien, quan tren, van trung
chat xuc » chat huu, cam xuc, chao xu
thai van » thi van, thanh van, thai vung
van hanh » van thanh, ban hanh, van anh
van nhan » van phan, van thanh, danh nhan
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 hai)). hieu ve chat xuc ((van nhan) or (van hanh)) thai van tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hoi) OR (o hai)). hieu ve chat xuc ((van nhan) OR (van hanh)) thai van tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) or (o hai)). hieu ve chat xuc ((van nhan) or (van hanh)) thai van tren*.