Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
thuc dan » thuc hanh, hoc dan, thuc vat
thuc day » thuc vat
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
hai cua » thai cua, dai cua, hoi cua
hieu ve » hieu van
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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: tu sach y nang ma hoi. ((hieu ve) or (hieu va)) cau ((thuc day) or (thuc dan)) hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. ((hieu ve) OR (hieu va)) cau ((thuc day) OR (thuc dan)) hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. ((hieu ve) or (hieu va)) cau ((thuc day) or (thuc dan)) hanh hai cua te*.