Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cua triet » cua viet, su triet, va triet
thanh ve » hanh ve, thanh va, thanh vien
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
cau luc » cau phuc
sac ky » cac ky, sai ky
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu va ((cau luc) or (cau truc)) ban thanh ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu va ((cau luc) OR (cau truc)) ban thanh ve cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu va ((cau luc) or (cau truc)) ban thanh ve cua triet".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sac ky)) nang xa hoi. hieu va ((cau luc) or (cau truc)) ban thanh ve cua triet*.