Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
thu nang » thi nang, thu hang, thu bang
hanh lai » hanh lam, hanh tai, thanh loi
duy manh » day manh, duy anh, duy ranh
sach thu » sach thue, sach thieu, sach tham
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, te sach
ca viet » va viet, co viet, hoa viet
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
x hoi » xa hoi, o hoi, x ho

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 thu nang x hoi. hieu va pham ((duy manh) or (duc manh)) ((hanh lai) OR (thanh lap)) ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang x hoi. hieu va pham ((duy manh) OR (duc manh)) ((hanh lai) OR (thanh lap)) ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang x hoi. hieu va pham ((duy manh) or (duc manh)) ((hanh lai) OR (thanh lap)) ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang x hoi. hieu va pham ((duy manh) or (duc manh)) ((hanh lai) OR (thanh lap)) ca viet*.