Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
vu sach » su sach
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
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: ((((vu sach) OR (vu bach))) or (vu khach)) ky nang x hoi. hieu ve cam tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (vu bach))) OR (vu khach)) ky nang x hoi. hieu ve cam tuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((vu sach) OR (vu bach))) or (vu khach)) ky nang x hoi. hieu ve cam tuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) OR (vu bach))) or (vu khach)) ky nang x hoi. hieu ve cam tuc va hanh vi cua tre*.