Perhaps you should try some spelling variations:
cua triet » su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
vu sach » vu bach, su sach, vu khach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty nang) or (ky nang)) ma hoa. hieu ve nam thuc van hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty nang) OR (ky nang)) ma hoa. hieu ve nam thuc van hanh vi ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty nang) or (ky nang)) ma hoa. hieu ve nam thuc van hanh vi ((cua triet) or (cua viet))*.