Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
ma hai » ta hai, va hai, xa hai
va cam » va cham, va cac, va cao
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 tang ma hai. hieu va cam ((xuc va) or (duc va)) don vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hai. hieu va cam ((xuc va) OR (duc va)) don vi cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ma hai. hieu va cam ((xuc va) or (duc va)) don vi cua te*.