Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
nang mai » nang tai, lang mai, nang cai
thanh de » hanh de, thanh ve, thanh do
ve cham » va cham, ve chat, vu cham
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
tu van » tu va
de cua » le cua, te cua, dieu cua
ve cai » va cai, ve cac, ve tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang mai) OR (nang ma)) hoi. hieu ((ve cai) or (ve cham)) tu van thanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang mai) OR (nang ma)) hoi. hieu ((ve cai) OR (ve cham)) tu van thanh de cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang mai) OR (nang ma)) hoi. hieu ((ve cai) or (ve cham)) tu van thanh de cua triet*".