Perhaps you should try some spelling variations:
quang phan » quang chan, quang phat, quang thanh
quan phan » luan phan, qua phan, quan pham
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
su viet » so viet
vi su » va su, ve su, ki su

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 ty) OR (sach y)) nang xa hoi. hieu ((quan phan) or (quang phan)) duc van hanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang xa hoi. hieu ((quan phan) OR (quang phan)) duc van hanh vi su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang xa hoi. hieu ((quan phan) or (quang phan)) duc van hanh vi su viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang xa hoi. hieu ((quan phan) or (quang phan)) duc van hanh vi su viet*.