Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
sach tu » sach thu, cach tu, sach uu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach y, sach thu, xach tay
cau luc » cau phuc
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

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