Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
doanh vai » doanh tai, doanh va, doanh van
van doanh » toan doanh, van dong, van thanh
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
vien cac » vien bach, vien dai, vien da
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van
cua te » cua tu

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) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu vien cac lo van doanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu vien cac lo van doanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu vien cac lo van doanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((toc sach) OR (hoc sach)))) ky nang xa hoi. hieu vien cac lo van doanh vai cua te*.