Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh dao » lanh dao, thanh dat, thanh dam
toc sach » hoc sach, doc sach, thuoc sach
sang ma » tang ma, sang tao, mang may
sach tu » sach thu, cach tu, sach ty
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
nang ma » tang ma, nang cao, mang may
dao cua » dai cua, day cua, dan cua
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 ((nang ma) or (sang ma)) hoi. hieu vien bach ((xuc van) OR (luc van)) hanh dao cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((nang ma) OR (sang ma)) hoi. hieu vien bach ((xuc van) OR (luc van)) hanh dao cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu ((nang ma) or (sang ma)) hoi. hieu vien bach ((xuc van) OR (luc van)) hanh dao cua su".
• Adding a wildcard symbol may retrieve word variants: toc sach tu ((nang ma) or (sang ma)) hoi. hieu vien bach ((xuc van) OR (luc van)) hanh dao cua su*.