Perhaps you should try some spelling variations:
thuat bao » thuat bai, thuat giao, thuat do
vu sach » vu bach, su sach, vu khach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
vi cuu » vi luu, vinh cuu

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 (thuat bao)) ky nang cao hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (thuat bao)) ky nang cao hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (thuat bao)) ky nang cao hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi cuu tre*.