Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan, thuc vat
nang mai » nang ma, nang tai, lang mai
thuc van » thuc vat, thuc va, thuc hanh
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam

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 ty nang mai hoi. hieu ve cam ((thuc dan) or (thuc van)) ((hang di) OR (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang mai hoi. hieu ve cam ((thuc dan) OR (thuc van)) ((hang di) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang mai hoi. hieu ve cam ((thuc dan) or (thuc van)) ((hang di) OR (hang vi)) cua triet*".