Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang cho » nang chon, ngang cho, nang cao
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
cua cau » cua cac, cua chu, cua can
dam van » dao van, nam van, pham van
dac van » cac van, dao van, duc van
van cac » van hac, van cau, van bac
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
cua cay » cua cac
anh vi » hanh vi, anh va, anh ve

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