Perhaps you should try some spelling variations:
van triet » va triet, van trieu, hanh triet
ban thanh » ban hanh, ban hang
van thiet » va thiet, dan thiet, can thiet
nang mai » nang ma, nang tai, lang mai
thuc ban » thuoc ban, thuc dan, thu ban
thanh va » thanh van, hanh va, thanh ha
vu sach » vu bach, su sach, vu khach
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va am » va lam, va cam

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 y nang mai hoi. hieu va am thuc ban thanh va ((van triet) OR (van thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang mai hoi. hieu va am thuc ban thanh va ((van triet) OR (van thiet))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang mai hoi. hieu va am thuc ban thanh va ((van triet) OR (van thiet))*.