Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
khanh lai » khanh luan, thanh lap, thanh loi
xay khanh » xa khanh, van khanh, vay khach
thuoc xay » thuc xay, truoc xay, thuat xay
nam thuoc » nam thuc, nam thu, nha thuoc
hieu ly » hieu ky, lieu ly, dieu ly
lai cua » dai cua, hai cua, lai chau
su sach » so sach
hieu le » hieu ve, hieu he, tieu le
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, vu khach

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 (vu sach)) ly nang ma hoa. ((hieu le) OR (hieu ly)) nam thuoc xay khanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly nang ma hoa. ((hieu le) OR (hieu ly)) nam thuoc xay khanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ly nang ma hoa. ((hieu le) OR (hieu ly)) nam thuoc xay khanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly nang ma hoa. ((hieu le) OR (hieu ly)) nam thuoc xay khanh lai cua triet*.