Perhaps you should try some spelling variations:
chieu toc » chieu tro, chieu tu, hieu hoc
va trien » va truyen, va thiet, va tuyen
ve triet » su triet
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
sach tru » sach truc, sach thu, sach tu
toc cham » toc thai
lang xa » lang ha, dang xay, lang van
duc van » duc va, duc tan, duc manh
nang xa » nang x, nang ma, mang xa
hanh de » hanh ve, hanh kem
su sach » so sach, vu sach

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

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