Perhaps you should try some spelling variations:
cao thuoc » cay thuoc, cua thuoc, nam thuoc
su triet » su viet, su tien, ve triet
phan lap » phan dau
cao truc » cau truc, vao truc, cao trung
hoi hoi » hoi hoc, hoc hoi, hoi doi
hieu vu » hieu va, hieu ve, hieu su
va phan » van phan, va phat, va phap
ty nang » ty xang, ty hang, ly nang
tu sach » thu sach, su sach, te sach
lap su » lap du, lap tu, lai 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 nang) or (ky nang)) hoi hoi. hieu vu ((cao truc) OR (cao thuoc)) va phan lap su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) hoi hoi. hieu vu ((cao truc) OR (cao thuoc)) va phan lap su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ky nang)) hoi hoi. hieu vu ((cao truc) OR (cao thuoc)) va phan lap su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) hoi hoi. hieu vu ((cao truc) OR (cao thuoc)) va phan lap su triet*.