Perhaps you should try some spelling variations:
hoang van » hang va
va trien » va truyen, va thiet, va tuyen
hanh dao » lanh dao, thanh dat, thanh dam
va hanh » van hanh, va thanh, va danh
cac tru » ca tru, cac tro, cac thu
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
te sach » toc sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
tru va » truc va, tu va, trung va
dao va » dao van, tao va, do va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (hoang van)) hoi. ((hieu ve) or (hieu va)) cac tru va hanh dao va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (hoang van)) hoi. ((hieu ve) OR (hieu va)) cac tru va hanh dao va trien.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (hoang van)) hoi. ((hieu ve) or (hieu va)) cac tru va hanh dao va trien*.