Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho
vi su » va su, ki su, oi su
ve su » va 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) OR (te sach)) v nang x hoi. hieu ve pham duc tan hanh ((vi su) or (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) v nang x hoi. hieu ve pham duc tan hanh ((vi su) OR (ve su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) v nang x hoi. hieu ve pham duc tan hanh ((vi su) or (ve su)) triet*".