Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
sach han » sach tham, sach danh, sach nang
han nang » phan nang, van nang, ban nang
cham tuc » nham thuc, tham thuc, cham soc
vat cua » mat cua, bat cua, dat cua
va sinh » va kinh, va tinh, vi sinh
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach han nang ((ma hoi) OR (mai hoi)). hieu ve ((cham tuc) or (pham thuc)) va sinh vat cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach han nang ((ma hoi) OR (mai hoi)). hieu ve ((cham tuc) OR (pham thuc)) va sinh vat cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach han nang ((ma hoi) OR (mai hoi)). hieu ve ((cham tuc) or (pham thuc)) va sinh vat cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach han nang ((ma hoi) OR (mai hoi)). hieu ve ((cham tuc) or (pham thuc)) va sinh vat cua triet*.