Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang tai » hang va, dung tai
cuc tren » cu tren, duc tren, nuoc tren
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang ma hoa. hieu ve cam ((xuc va) or (duc va)) hang tai cuc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ma hoa. hieu ve cam ((xuc va) OR (duc va)) hang tai cuc tren*.