Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
nang co » nang cao, nang doc, nang noi
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
co hoi » co hoc, co loi
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach y) or (sach ty)) nang co hoi. hieu va cac luc va dinh vi ((hoa viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach ty)) nang co hoi. hieu va cac luc va dinh vi ((hoa viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach ty)) nang co hoi. hieu va cac luc va dinh vi ((hoa viet) or (cua vat))*.