Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tri » thanh tri, hanh tai, hanh trinh
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
va cam » va cham, va cac, va cao
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van
cua tu » cua tuc, cua cu, cua te
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: ((hoc sach) or (te sach)) ky lang xa hoi. hieu va cam lo van hanh tri ((cua tu) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (te sach)) ky lang xa hoi. hieu va cam lo van hanh tri ((cua tu) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (te sach)) ky lang xa hoi. hieu va cam lo van hanh tri ((cua tu) or (cua su))*.