Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
hanh dao » lanh dao, thanh dat, thanh dam
tan hanh » tan thanh, tang hanh, toan hanh
sach thu » sach thue, sach thieu, sach tham
cham duc » cham soc, pham duy, phan duc
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
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: tu ((sach ty) or (sach thu)) nang xa hoi. hieu ve ((cham duc) OR (pham duc)) tan hanh dao va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu ve ((cham duc) OR (pham duc)) tan hanh dao va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach thu)) nang xa hoi. hieu ve ((cham duc) OR (pham duc)) tan hanh dao va trien".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu ve ((cham duc) OR (pham duc)) tan hanh dao va trien*.