Perhaps you should try some spelling variations:
nang doc » nang luc
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
doc hoi » duoc hoi, hoc hoi, doc hai
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
bo sach » co sach, hoc sach
ca tren » cau tren, cu tren, la tren
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
loc va » hoc va, luc va
vai ca » vai cac, vai cua, bai ca

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) or (bo sach)) ty nang doc hoi. hieu ve cam ((xuc va) or (loc va)) hanh vai ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) ty nang doc hoi. hieu ve cam ((xuc va) OR (loc va)) hanh vai ca tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (bo sach)) ty nang doc hoi. hieu ve cam ((xuc va) or (loc va)) hanh vai ca tren*.