Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh da » tinh va, tinh gia, tinh lao
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
y tang » ky tang, 6 tang, 5 tang
tuc va » thuc va, tuc xa, duc va
7 tang » 6 tang
da cua » dai cua, day cua, dan cua
va cam » va cham, va cac, va cao

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 tang) or (7 tang)) ma hoi. hieu va cam ((tuc va) OR (truc va)) tinh da cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y tang) OR (7 tang)) ma hoi. hieu va cam ((tuc va) OR (truc va)) tinh da cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y tang) or (7 tang)) ma hoi. hieu va cam ((tuc va) OR (truc va)) tinh da cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y tang) or (7 tang)) ma hoi. hieu va cam ((tuc va) OR (truc va)) tinh da cua triet*.