Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
qua pham » quan pham, quy pham, qua cham
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang ma » tang ma, sang ma, nang cao
va hanh » va thanh, va danh, ban hanh
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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 ma hoi. hieu qua pham duc ((va hanh) or (van hanh)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ma hoi. hieu qua pham duc ((va hanh) OR (van hanh)) di cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ma hoi. hieu qua pham duc ((va hanh) or (van hanh)) di cua triet*.