Perhaps you should try some spelling variations:
sang tao » hang tai
vai cua » dai cua, hai cua, lai cua
don vai » don vi, don va, den vai
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
sang ma » tang ma, nang ma, mang may
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
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 ((sang ma) or (sang tao)) hai. hieu ve cam ((xuc va) or (duc va)) don vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((sang ma) OR (sang tao)) hai. hieu ve cam ((xuc va) OR (duc va)) don vai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((sang ma) or (sang tao)) hai. hieu ve cam ((xuc va) or (duc va)) don vai cua te*.