Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
thu sach » thuat sach, thuoc sach, thu hoach
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » su sach, te sach, tu cach
lai cuu » lai cua, lai chau, lai cuoc
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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 (thu sach)) ty nang x hoi. hieu ((ve cam) or (vien cac)) xuc va hanh lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang x hoi. hieu ((ve cam) OR (vien cac)) xuc va hanh lai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty nang x hoi. hieu ((ve cam) or (vien cac)) xuc va hanh lai cuu tre*.