Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh lap » thanh san, phan lap, thanh hai
cua triet » su triet, va triet
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
van cam » van nam, van lam, van cau
xuc dan » tuc dan, duc dan, xuc ban
y nang » ky nang, v nang, may nang

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 nang) or (ly nang)) ma hoa. hieu van cam xuc dan thanh lap ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) ma hoa. hieu van cam xuc dan thanh lap ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ly nang)) ma hoa. hieu van cam xuc dan thanh lap ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ly nang)) ma hoa. hieu van cam xuc dan thanh lap ((cua triet) OR (cua viet))*.