Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
qua tham » qua cham, qua than, qua thanh
dan hanh » dang hanh, dan khanh, dan thanh
tham hoc » thai hoc, tham hoa, than hoc
su triet » su viet, su tien, ve triet
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
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: hoc ((sach ky) or (sach ty)) nang ma hoi. hieu qua tham hoc dan hanh vi ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach ty)) nang ma hoi. hieu qua tham hoc dan hanh vi ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) or (sach ty)) nang ma hoi. hieu qua tham hoc dan hanh vi ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) or (sach ty)) nang ma hoi. hieu qua tham hoc dan hanh vi ((cua triet) OR (su triet))*.