Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
le thang » le thanh, le tang, le quang
ke thang » ke trang, ke thuong, ke toan
thu nang » thi nang, thu hang, thu bang
va hanh » van hanh, va danh, ban hanh
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
ki su » ky su

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 thu nang xa hoi. hieu ((ke thang) OR (le thang)) dau ((va hanh) or (va thanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu nang xa hoi. hieu ((ke thang) OR (le thang)) dau ((va hanh) OR (va thanh)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thu nang xa hoi. hieu ((ke thang) OR (le thang)) dau ((va hanh) or (va thanh)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach thu nang xa hoi. hieu ((ke thang) OR (le thang)) dau ((va hanh) or (va thanh)) ki su triet*.