Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cua triet » cua viet, su triet, va triet
dinh dien » tinh dien, kinh dien, dich dien
va trien » va truyen, va thiet, va tuyen
vat dinh » va dinh, van dinh, vat sinh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
vu nang » vuc nang, va nang, vu dang
ve cach » va cach, ve cac, ve canh
v nang » va nang, van nang, voi 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 ((v nang) or (vu nang)) xa hoi. hieu ve cach thuc vat dinh dien ((cua triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) xa hoi. hieu ve cach thuc vat dinh dien ((cua triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vu nang)) xa hoi. hieu ve cach thuc vat dinh dien ((cua triet) or (va trien))*.