Perhaps you should try some spelling variations:
sang tai » hang tai, sang tao, tang tai
sach ky » sach y, sach ty, sach kem
danh vi » hanh vi, dinh vi, danh di
hieu va » lieu va, hieu qua
tai hai » thi hai, dai hai, tai ha
sac ky » cac ky, sai ky
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: su ((sach ky) OR (sac 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: su ((sach ky) OR (sac 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: "su ((sach ky) OR (sac ky)) sang tai hai. hieu va cac ((xuc va) or (duc va)) danh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) sang tai hai. hieu va cac ((xuc va) or (duc va)) danh vi cua te*.