Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
hieu vien » hieu hien, hieu viec, thieu nien
hanh dao » lanh dao, thanh dat, doanh dao
vien cac » vien bach, vien dai, vien da
nang ma » tang ma, sang ma, nang cao
sach tu » sach thu, cach tu, sach uu
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
sach ty » sach y, sach thu, xach tay
ma hoi » mai hoi, xa hoi, ma hoa
cua su » qua su

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)) nang ma hoi. hieu vien cac xuc van ((hanh dao) OR (thanh dam)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (sach ty)) nang ma hoi. hieu vien cac xuc van ((hanh dao) OR (thanh dam)) cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) or (sach ty)) nang ma hoi. hieu vien cac xuc van ((hanh dao) OR (thanh dam)) cua su".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) or (sach ty)) nang ma hoi. hieu vien cac xuc van ((hanh dao) OR (thanh dam)) cua su*.