Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
sang tai » hang tai, sang tao, tang tai
hieu va » lieu va, hieu qua
danh vi » hanh vi, dinh vi, danh di
vu sach » vu bach, su sach
tai hai » thi hai, dai hai, tai ha
ky sang » ky nang, ky dang, ky tang
xuc va » tuc va, luc va, xac va
vi cua » vai cua, di cua
cua te » cua tu

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 khach)) ky sang tai hai. hieu va cac ((xuc va) or (duc va)) danh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky sang tai hai. hieu va cac ((xuc va) OR (duc va)) danh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky sang tai hai. hieu va cac ((xuc va) or (duc va)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky sang tai hai. hieu va cac ((xuc va) or (duc va)) danh vi cua te*.