Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
sach thu » sach thue, sach thieu, sach tham
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
nano co » nano cuo, nang co, nano o
sach tu » cach tu, sach uu, sach xu
sach ty » sach y, xach tay, sach hay
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di cua

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 tu) or (((sach ty) OR (sach thu)))) nano co hoc. hieu vien cac xuc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (((sach ty) OR (sach thu)))) nano co hoc. hieu vien cac xuc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) or (((sach ty) OR (sach thu)))) nano co hoc. hieu vien cac xuc van hanh vi cua cau*".