Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
ve triet » su triet
sach thu » sach thue, sach thieu, sach tham
chieu tu » chieu tro, lieu tu, chu tu
sach tru » sach truc, sach tu, sach tren
cham duc » pham duc, cham soc, pham duy
hanh de » hanh ve, hanh kem
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
tu cham » toc cham, thi cham

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 tru) OR (sach thu)) nang xa hoi. chieu tu cham duc van hanh de ((ve triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tru) OR (sach thu)) nang xa hoi. chieu tu cham duc van hanh de ((ve triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tru) OR (sach thu)) nang xa hoi. chieu tu cham duc van hanh de ((ve triet) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tru) OR (sach thu)) nang xa hoi. chieu tu cham duc van hanh de ((ve triet) or (va trien))*.