Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, vien da
gian cua » gian xu, ban cua
manh dan » canh dan, sanh dan, manh toan
duc manh » suc manh, duc anh, duc minh
tu sach » thu sach, su sach, te sach
nang o » nang co, nang ho, nang ro
ve cac » va cac
o hoi » co hoi, o hoc, o hai

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 (thu hoach)) ky nang o hoi. hieu ((ve cac) or (vien cac)) duc manh dan gian cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang o hoi. hieu ((ve cac) OR (vien cac)) duc manh dan gian cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang o hoi. hieu ((ve cac) or (vien cac)) duc manh dan gian cua triet*.