Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
tuc gia » duc gia, toc gia, luc gia
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
anh vi » hanh vi, anh va, anh ve
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: toc sach ty nang mai hoi. hieu ve cam ((tuc gia) OR (tac gia)) anh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang mai hoi. hieu ve cam ((tuc gia) OR (tac gia)) anh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang mai hoi. hieu ve cam ((tuc gia) OR (tac gia)) anh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang mai hoi. hieu ve cam ((tuc gia) OR (tac gia)) anh vi ((cua tre) or (cua te))*.