Perhaps you should try some spelling variations:
van trieu » tan trieu, van tieu, van hieu
van triet » va triet, van thiet, hanh triet
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
truc va » thuc va, thuc vat, trung va
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
va cau » van cau, va dau, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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