Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau theo » cau thi, cau tao
hanh vai » hanh vi, hanh va, hanh tai
sach tu » sach thu, cach tu, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
ve cac » va cac, vien cac
xac va » tac va, ac va, bac va
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 tu nang x hoi. hieu ve cac ((xac va) or (duc va)) hanh vai ((cau theo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang x hoi. hieu ve cac ((xac va) OR (duc va)) hanh vai ((cau theo) OR (cau triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. hieu ve cac ((xac va) or (duc va)) hanh vai ((cau theo) or (cau triet))*.