Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va triet » va trien, ve triet, cua triet
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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 ma hoi. hieu ((ve cam) OR (ve cac)) thuc va thanh vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) thuc va thanh vai ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) thuc va thanh vai ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ((ve cam) OR (ve cac)) thuc va thanh vai ((va triet) or (va thiet))*.