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