Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc van » thuc vat, thuc dan, thuc va
truc dan » thuc dan, tuc dan, truc ban
nang mai » nang ma, nang tai, lang mai
hang di » hang doi, hang vi, hang dien
su sach » vu sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
di cua » dai cua, doi cua, de cua
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) OR (so sach)) ty nang mai hoi. hieu ve cam ((truc dan) or (thuc van)) hang di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang mai hoi. hieu ve cam ((truc dan) OR (thuc van)) hang di cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang mai hoi. hieu ve cam ((truc dan) or (thuc van)) hang di cua triet*".