Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
nang cho » nang chon, ngang cho, nang cao
cac xuc » cam xuc, cac nuoc, chat xuc
anh hoc » sinh hoc, benh hoc, hinh hoc
anh doc » anh duc, nang doc, anh dong
xuc van » duc van, luc van, vuc van
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac

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) OR (doc sach)) ty nang cho hoc. hieu ve cac xuc van ((anh doc) or (anh hoc)) cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ty nang cho hoc. hieu ve cac xuc van ((anh doc) OR (anh hoc)) cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ty nang cho hoc. hieu ve cac xuc van ((anh doc) or (anh hoc)) cua cau*".