Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
thuc dang » thuoc dang, thuc dan, thuc dung
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
hieu cua » hieu qua, dieu cua, bieu cua
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu ha » hieu hoa, hieu va, hieu ca
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
ha hoi » ha noi, xa hoi, va hoi
vai va » mai va, dai va, hai va

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 ky lang ((ha hoi) OR (hoa hoi)). ((hieu ha) or (hieu cua)) nam thuc dang hanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ((ha hoi) OR (hoa hoi)). ((hieu ha) OR (hieu cua)) nam thuc dang hanh vai va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang ((ha hoi) OR (hoa hoi)). ((hieu ha) or (hieu cua)) nam thuc dang hanh vai va triet*".