Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thu nang » thi nang, thu hang, thu bang
su triet » su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
va chat » van chat, va phat, cao chat
ve chat » van chat
cao hoi » cau hoi, co hoi, cao hoc
su viet » so viet

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 cao hoi. hieu ((ve chat) or (va chat)) truc va thanh dai ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang cao hoi. hieu ((ve chat) OR (va chat)) truc va thanh dai ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang cao hoi. hieu ((ve chat) or (va chat)) truc va thanh dai ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang cao hoi. hieu ((ve chat) or (va chat)) truc va thanh dai ((su triet) OR (su viet))*.