Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
duc manh » suc manh, duc anh, duc minh
minh dai » minh dao, sinh dai, minh hai
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
qua cao » qua cac, qua ca, qua cai
duc van » duc va, duc tan, duc phan
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach ty)) nang ma hoi. hieu qua cao ((duc van) or (duc manh)) minh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang ma hoi. hieu qua cao ((duc van) OR (duc manh)) minh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang ma hoi. hieu qua cao ((duc van) or (duc manh)) minh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang ma hoi. hieu qua cao ((duc van) or (duc manh)) minh dai cua triet*.