Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
san hanh » san thanh, ban hanh, van hanh
cham cuu » cap cuu, chat cua
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cuu san » cuu van, cua san, cuu ban
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
o lang » hoa lang, hoi lang
y lang » _ lang, tay lang, yen lang

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 ((y lang) or (o lang)) xa hoi. hieu van cham cuu san hanh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y lang) OR (o lang)) xa hoi. hieu van cham cuu san hanh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y lang) or (o lang)) xa hoi. hieu van cham cuu san hanh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ((y lang) or (o lang)) xa hoi. hieu van cham cuu san hanh di ((cua tre) OR (cua triet))*.