Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cua triet » cua viet, su triet
cac thuc » cac thu, can thuc, cay thuc
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
vu sach » vu bach, su sach, vu khach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach v nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) van hanh di ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach v nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) van hanh di ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach v nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) van hanh di ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: vu sach v nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) van hanh di ((cua triet) or (va triet))*.