Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
danh dai » danh dau, danh di, danh sai
thuc day » thuc dan, thuc vat
hieu cao » chieu cao, hieu cac, hieu ca
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan
ma hoi » xa hoi, ma hoa, me hoi
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: hoc sach ky nang ((ma hoi) OR (mai hoi)). hieu cao chat ((thuc va) or (thuc day)) danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang ((ma hoi) OR (mai hoi)). hieu cao chat ((thuc va) OR (thuc day)) danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang ((ma hoi) OR (mai hoi)). hieu cao chat ((thuc va) or (thuc day)) danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang ((ma hoi) OR (mai hoi)). hieu cao chat ((thuc va) or (thuc day)) danh dai cua te*.