Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach 2 » sach y
ma hoi » mai hoi, xa hoi, me hoi
2 nang » v nang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach 2 nang ((ma hoi) or (ma hoa)). ((hieu ve) OR (hieu va)) cac duc va hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach 2 nang ((ma hoi) OR (ma hoa)). ((hieu ve) OR (hieu va)) cac duc va hanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach 2 nang ((ma hoi) or (ma hoa)). ((hieu ve) OR (hieu va)) cac duc va hanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang ((ma hoi) or (ma hoa)). ((hieu ve) OR (hieu va)) cac duc va hanh hai cua te*.